diff --git a/compatibility/smoke/BUILD.bazel b/compatibility/smoke/BUILD.bazel
index 8575394b073d9..79721ffa3065f 100644
--- a/compatibility/smoke/BUILD.bazel
+++ b/compatibility/smoke/BUILD.bazel
@@ -1,4 +1,18 @@
 load("@rules_java//java:defs.bzl", "java_test")
 load("//compatibility/smoke:stale_gencode_smoke_test.bzl", "stale_gencode_smoke_test")
 
+stale_gencode_smoke_test("3.8.0")
+
+stale_gencode_smoke_test("3.11.0")
+
 stale_gencode_smoke_test("3.19.0")
+
+stale_gencode_smoke_test("3.20.0")
+
+stale_gencode_smoke_test("21.12")  # Patch release chosen because patches on 21.x added CVE fixes.
+
+stale_gencode_smoke_test("25.8")  # Patch release with CVE fixes and the likely final PBJ 3.x release.
+
+stale_gencode_smoke_test("26.0")
+
+stale_gencode_smoke_test("32.1")
diff --git a/compatibility/smoke/proto3_gencode_test.proto b/compatibility/smoke/proto3_gencode_test.proto
index ca6a945964166..891eba7637ff2 100644
--- a/compatibility/smoke/proto3_gencode_test.proto
+++ b/compatibility/smoke/proto3_gencode_test.proto
@@ -5,7 +5,7 @@ package legacy_gencode_test.proto3;
 option java_outer_classname = "Proto3GencodeTestProto";
 
 message TestMessage {
-  optional string x = 2;
+  string x = 2;
   NestedTestMessage y = 3;
 }
 
diff --git a/compatibility/smoke/v21.12/BUILD.bazel b/compatibility/smoke/v21.12/BUILD.bazel
new file mode 100644
index 0000000000000..599ca4733284a
--- /dev/null
+++ b/compatibility/smoke/v21.12/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@rules_java//java:java_library.bzl", "java_library")
+
+java_library(
+    name = "checked_in_gencode",
+    srcs = glob(["**/*.java"]),
+    visibility = ["//compatibility:__subpackages__"],
+    deps = ["//:protobuf_java"],
+)
diff --git a/compatibility/smoke/v21.12/legacy_gencode_test/proto3/Proto3GencodeTestProto.java b/compatibility/smoke/v21.12/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
new file mode 100644
index 0000000000000..148f248c5db4f
--- /dev/null
+++ b/compatibility/smoke/v21.12/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
@@ -0,0 +1,1524 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: proto3_gencode_test.proto
+
+package legacy_gencode_test.proto3;
+
+public final class Proto3GencodeTestProto {
+  private Proto3GencodeTestProto() {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+
+  public interface TestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.TestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    java.lang.String getX();
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    com.google.protobuf.ByteString getXBytes();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    boolean hasY();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY();
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder getYOrBuilder();
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+  public static final class TestMessage extends com.google.protobuf.GeneratedMessageV3
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.TestMessage)
+      TestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use TestMessage.newBuilder() to construct.
+    private TestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+
+    private TestMessage() {
+      x_ = "";
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new TestMessage();
+    }
+
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+      return this.unknownFields;
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+    }
+
+    public static final int X_FIELD_NUMBER = 2;
+
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object x_ = "";
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    @java.lang.Override
+    public java.lang.String getX() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        x_ = s;
+        return s;
+      }
+    }
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString getXBytes() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        x_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int Y_FIELD_NUMBER = 3;
+    private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    @java.lang.Override
+    public boolean hasY() {
+      return y_ != null;
+    }
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+        getYOrBuilder() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(x_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, x_);
+      }
+      if (y_ != null) {
+        output.writeMessage(3, getY());
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(x_)) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, x_);
+      }
+      if (y_ != null) {
+        size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getY());
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) obj;
+
+      if (!getX().equals(other.getX())) return false;
+      if (hasY() != other.hasY()) return false;
+      if (hasY()) {
+        if (!getY().equals(other.getY())) return false;
+      }
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + X_FIELD_NUMBER;
+      hash = (53 * hash) + getX().hashCode();
+      if (hasY()) {
+        hash = (37 * hash) + Y_FIELD_NUMBER;
+        hash = (53 * hash) + getY().hashCode();
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.TestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+      }
+
+      // Construct using legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.newBuilder()
+      private Builder() {}
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        x_ = "";
+        y_ = null;
+        if (yBuilder_ != null) {
+          yBuilder_.dispose();
+          yBuilder_ = null;
+        }
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage(this);
+        if (bitField0_ != 0) {
+          buildPartial0(result);
+        }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          result.x_ = x_;
+        }
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          result.y_ = yBuilder_ == null ? y_ : yBuilder_.build();
+        }
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) {
+          return mergeFrom((legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance())
+          return this;
+        if (!other.getX().isEmpty()) {
+          x_ = other.x_;
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
+        if (other.hasY()) {
+          mergeY(other.getY());
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 18:
+                {
+                  x_ = input.readStringRequireUtf8();
+                  bitField0_ |= 0x00000001;
+                  break;
+                } // case 18
+              case 26:
+                {
+                  input.readMessage(getYFieldBuilder().getBuilder(), extensionRegistry);
+                  bitField0_ |= 0x00000002;
+                  break;
+                } // case 26
+              default:
+                {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+
+      private int bitField0_;
+
+      private java.lang.Object x_ = "";
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The x.
+       */
+      public java.lang.String getX() {
+        java.lang.Object ref = x_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          x_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The bytes for x.
+       */
+      public com.google.protobuf.ByteString getXBytes() {
+        java.lang.Object ref = x_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b =
+              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+          x_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setX(java.lang.String value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        x_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearX() {
+        x_ = getDefaultInstance().getX();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The bytes for x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setXBytes(com.google.protobuf.ByteString value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        checkByteStringIsUtf8(value);
+        x_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          yBuilder_;
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return Whether the y field is set.
+       */
+      public boolean hasY() {
+        return ((bitField0_ & 0x00000002) != 0);
+      }
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return The y.
+       */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+        if (yBuilder_ == null) {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        } else {
+          return yBuilder_.getMessage();
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          y_ = value;
+        } else {
+          yBuilder_.setMessage(value);
+        }
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+              builderForValue) {
+        if (yBuilder_ == null) {
+          y_ = builderForValue.build();
+        } else {
+          yBuilder_.setMessage(builderForValue.build());
+        }
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder mergeY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (((bitField0_ & 0x00000002) != 0)
+              && y_ != null
+              && y_
+                  != legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                      .getDefaultInstance()) {
+            getYBuilder().mergeFrom(value);
+          } else {
+            y_ = value;
+          }
+        } else {
+          yBuilder_.mergeFrom(value);
+        }
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder clearY() {
+        bitField0_ = (bitField0_ & ~0x00000002);
+        y_ = null;
+        if (yBuilder_ != null) {
+          yBuilder_.dispose();
+          yBuilder_ = null;
+        }
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+          getYBuilder() {
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return getYFieldBuilder().getBuilder();
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+          getYOrBuilder() {
+        if (yBuilder_ != null) {
+          return yBuilder_.getMessageOrBuilder();
+        } else {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          getYFieldBuilder() {
+        if (yBuilder_ == null) {
+          yBuilder_ =
+              new com.google.protobuf.SingleFieldBuilderV3<
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>(
+                  getY(), getParentForChildren(), isClean());
+          y_ = null;
+        }
+        return yBuilder_;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.TestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.TestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<TestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<TestMessage>() {
+          @java.lang.Override
+          public TestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            Builder builder = newBuilder();
+            try {
+              builder.mergeFrom(input, extensionRegistry);
+            } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+              throw e.setUnfinishedMessage(builder.buildPartial());
+            } catch (com.google.protobuf.UninitializedMessageException e) {
+              throw e.asInvalidProtocolBufferException()
+                  .setUnfinishedMessage(builder.buildPartial());
+            } catch (java.io.IOException e) {
+              throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                  .setUnfinishedMessage(builder.buildPartial());
+            }
+            return builder.buildPartial();
+          }
+        };
+
+    public static com.google.protobuf.Parser<TestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<TestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  public interface NestedTestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.NestedTestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    java.util.List<java.lang.Integer> getZList();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    int getZCount();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    int getZ(int index);
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+  public static final class NestedTestMessage extends com.google.protobuf.GeneratedMessageV3
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.NestedTestMessage)
+      NestedTestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use NestedTestMessage.newBuilder() to construct.
+    private NestedTestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+
+    private NestedTestMessage() {
+      z_ = emptyIntList();
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new NestedTestMessage();
+    }
+
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+      return this.unknownFields;
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+    }
+
+    public static final int Z_FIELD_NUMBER = 1;
+
+    @SuppressWarnings("serial")
+    private com.google.protobuf.Internal.IntList z_;
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    @java.lang.Override
+    public java.util.List<java.lang.Integer> getZList() {
+      return z_;
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    public int getZCount() {
+      return z_.size();
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    public int getZ(int index) {
+      return z_.getInt(index);
+    }
+
+    private int zMemoizedSerializedSize = -1;
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      getSerializedSize();
+      if (getZList().size() > 0) {
+        output.writeUInt32NoTag(10);
+        output.writeUInt32NoTag(zMemoizedSerializedSize);
+      }
+      for (int i = 0; i < z_.size(); i++) {
+        output.writeInt32NoTag(z_.getInt(i));
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      {
+        int dataSize = 0;
+        for (int i = 0; i < z_.size(); i++) {
+          dataSize += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(z_.getInt(i));
+        }
+        size += dataSize;
+        if (!getZList().isEmpty()) {
+          size += 1;
+          size += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(dataSize);
+        }
+        zMemoizedSerializedSize = dataSize;
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) obj;
+
+      if (!getZList().equals(other.getZList())) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      if (getZCount() > 0) {
+        hash = (37 * hash) + Z_FIELD_NUMBER;
+        hash = (53 * hash) + getZList().hashCode();
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(
+            java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.NestedTestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+      }
+
+      // Construct using
+      // legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder()
+      private Builder() {}
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        z_ = emptyIntList();
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+            .getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage(this);
+        buildPartialRepeatedFields(result);
+        if (bitField0_ != 0) {
+          buildPartial0(result);
+        }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartialRepeatedFields(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result) {
+        if (((bitField0_ & 0x00000001) != 0)) {
+          z_.makeImmutable();
+          bitField0_ = (bitField0_ & ~0x00000001);
+        }
+        result.z_ = z_;
+      }
+
+      private void buildPartial0(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result) {
+        int from_bitField0_ = bitField0_;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) {
+          return mergeFrom(
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                .getDefaultInstance()) return this;
+        if (!other.z_.isEmpty()) {
+          if (z_.isEmpty()) {
+            z_ = other.z_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureZIsMutable();
+            z_.addAll(other.z_);
+          }
+          onChanged();
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 8:
+                {
+                  int v = input.readInt32();
+                  ensureZIsMutable();
+                  z_.addInt(v);
+                  break;
+                } // case 8
+              case 10:
+                {
+                  int length = input.readRawVarint32();
+                  int limit = input.pushLimit(length);
+                  ensureZIsMutable();
+                  while (input.getBytesUntilLimit() > 0) {
+                    z_.addInt(input.readInt32());
+                  }
+                  input.popLimit(limit);
+                  break;
+                } // case 10
+              default:
+                {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+
+      private int bitField0_;
+
+      private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+      private void ensureZIsMutable() {
+        if (!((bitField0_ & 0x00000001) != 0)) {
+          z_ = mutableCopy(z_);
+          bitField0_ |= 0x00000001;
+        }
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return A list containing the z.
+       */
+      public java.util.List<java.lang.Integer> getZList() {
+        return ((bitField0_ & 0x00000001) != 0) ? java.util.Collections.unmodifiableList(z_) : z_;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return The count of z.
+       */
+      public int getZCount() {
+        return z_.size();
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index of the element to return.
+       * @return The z at the given index.
+       */
+      public int getZ(int index) {
+        return z_.getInt(index);
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index to set the value at.
+       * @param value The z to set.
+       * @return This builder for chaining.
+       */
+      public Builder setZ(int index, int value) {
+
+        ensureZIsMutable();
+        z_.setInt(index, value);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param value The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addZ(int value) {
+
+        ensureZIsMutable();
+        z_.addInt(value);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param values The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addAllZ(java.lang.Iterable<? extends java.lang.Integer> values) {
+        ensureZIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, z_);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearZ() {
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<NestedTestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<NestedTestMessage>() {
+          @java.lang.Override
+          public NestedTestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            Builder builder = newBuilder();
+            try {
+              builder.mergeFrom(input, extensionRegistry);
+            } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+              throw e.setUnfinishedMessage(builder.buildPartial());
+            } catch (com.google.protobuf.UninitializedMessageException e) {
+              throw e.asInvalidProtocolBufferException()
+                  .setUnfinishedMessage(builder.buildPartial());
+            } catch (java.io.IOException e) {
+              throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                  .setUnfinishedMessage(builder.buildPartial());
+            }
+            return builder.buildPartial();
+          }
+        };
+
+    public static com.google.protobuf.Parser<NestedTestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<NestedTestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable;
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
+    return descriptor;
+  }
+
+  private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
+
+  static {
+    java.lang.String[] descriptorData = {
+      "\n\031proto3_gencode_test.proto\022\032legacy_genc"
+          + "ode_test.proto3\"R\n\013TestMessage\022\t\n\001x\030\002 \001("
+          + "\t\0228\n\001y\030\003 \001(\0132-.legacy_gencode_test.proto"
+          + "3.NestedTestMessage\"\036\n\021NestedTestMessage"
+          + "\022\t\n\001z\030\001 \003(\005B\030B\026Proto3GencodeTestProtob\006p"
+          + "roto3"
+    };
+    descriptor =
+        com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
+            descriptorData, new com.google.protobuf.Descriptors.FileDescriptor[] {});
+    internal_static_legacy_gencode_test_proto3_TestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(0);
+    internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_TestMessage_descriptor,
+            new java.lang.String[] {
+              "X", "Y",
+            });
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(1);
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor,
+            new java.lang.String[] {
+              "Z",
+            });
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}
diff --git a/compatibility/smoke/v25.8/BUILD.bazel b/compatibility/smoke/v25.8/BUILD.bazel
new file mode 100644
index 0000000000000..599ca4733284a
--- /dev/null
+++ b/compatibility/smoke/v25.8/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@rules_java//java:java_library.bzl", "java_library")
+
+java_library(
+    name = "checked_in_gencode",
+    srcs = glob(["**/*.java"]),
+    visibility = ["//compatibility:__subpackages__"],
+    deps = ["//:protobuf_java"],
+)
diff --git a/compatibility/smoke/v25.8/legacy_gencode_test/proto3/Proto3GencodeTestProto.java b/compatibility/smoke/v25.8/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
new file mode 100644
index 0000000000000..92cc5d21e8ae9
--- /dev/null
+++ b/compatibility/smoke/v25.8/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
@@ -0,0 +1,1529 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: proto3_gencode_test.proto
+
+// Protobuf Java Version: 3.25.8
+package legacy_gencode_test.proto3;
+
+public final class Proto3GencodeTestProto {
+  private Proto3GencodeTestProto() {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+
+  public interface TestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.TestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    java.lang.String getX();
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    com.google.protobuf.ByteString getXBytes();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    boolean hasY();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY();
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder getYOrBuilder();
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+  public static final class TestMessage extends com.google.protobuf.GeneratedMessageV3
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.TestMessage)
+      TestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use TestMessage.newBuilder() to construct.
+    private TestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+
+    private TestMessage() {
+      x_ = "";
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new TestMessage();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+    }
+
+    private int bitField0_;
+    public static final int X_FIELD_NUMBER = 2;
+
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object x_ = "";
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    @java.lang.Override
+    public java.lang.String getX() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        x_ = s;
+        return s;
+      }
+    }
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString getXBytes() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        x_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int Y_FIELD_NUMBER = 3;
+    private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    @java.lang.Override
+    public boolean hasY() {
+      return ((bitField0_ & 0x00000001) != 0);
+    }
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+        getYOrBuilder() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(x_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, x_);
+      }
+      if (((bitField0_ & 0x00000001) != 0)) {
+        output.writeMessage(3, getY());
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(x_)) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, x_);
+      }
+      if (((bitField0_ & 0x00000001) != 0)) {
+        size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getY());
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) obj;
+
+      if (!getX().equals(other.getX())) return false;
+      if (hasY() != other.hasY()) return false;
+      if (hasY()) {
+        if (!getY().equals(other.getY())) return false;
+      }
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + X_FIELD_NUMBER;
+      hash = (53 * hash) + getX().hashCode();
+      if (hasY()) {
+        hash = (37 * hash) + Y_FIELD_NUMBER;
+        hash = (53 * hash) + getY().hashCode();
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.TestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+      }
+
+      // Construct using legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
+          getYFieldBuilder();
+        }
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        x_ = "";
+        y_ = null;
+        if (yBuilder_ != null) {
+          yBuilder_.dispose();
+          yBuilder_ = null;
+        }
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage(this);
+        if (bitField0_ != 0) {
+          buildPartial0(result);
+        }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          result.x_ = x_;
+        }
+        int to_bitField0_ = 0;
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          result.y_ = yBuilder_ == null ? y_ : yBuilder_.build();
+          to_bitField0_ |= 0x00000001;
+        }
+        result.bitField0_ |= to_bitField0_;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) {
+          return mergeFrom((legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance())
+          return this;
+        if (!other.getX().isEmpty()) {
+          x_ = other.x_;
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
+        if (other.hasY()) {
+          mergeY(other.getY());
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 18:
+                {
+                  x_ = input.readStringRequireUtf8();
+                  bitField0_ |= 0x00000001;
+                  break;
+                } // case 18
+              case 26:
+                {
+                  input.readMessage(getYFieldBuilder().getBuilder(), extensionRegistry);
+                  bitField0_ |= 0x00000002;
+                  break;
+                } // case 26
+              default:
+                {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+
+      private int bitField0_;
+
+      private java.lang.Object x_ = "";
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The x.
+       */
+      public java.lang.String getX() {
+        java.lang.Object ref = x_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          x_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The bytes for x.
+       */
+      public com.google.protobuf.ByteString getXBytes() {
+        java.lang.Object ref = x_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b =
+              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+          x_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setX(java.lang.String value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        x_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearX() {
+        x_ = getDefaultInstance().getX();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The bytes for x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setXBytes(com.google.protobuf.ByteString value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        checkByteStringIsUtf8(value);
+        x_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          yBuilder_;
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return Whether the y field is set.
+       */
+      public boolean hasY() {
+        return ((bitField0_ & 0x00000002) != 0);
+      }
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return The y.
+       */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+        if (yBuilder_ == null) {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        } else {
+          return yBuilder_.getMessage();
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          y_ = value;
+        } else {
+          yBuilder_.setMessage(value);
+        }
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+              builderForValue) {
+        if (yBuilder_ == null) {
+          y_ = builderForValue.build();
+        } else {
+          yBuilder_.setMessage(builderForValue.build());
+        }
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder mergeY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (((bitField0_ & 0x00000002) != 0)
+              && y_ != null
+              && y_
+                  != legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                      .getDefaultInstance()) {
+            getYBuilder().mergeFrom(value);
+          } else {
+            y_ = value;
+          }
+        } else {
+          yBuilder_.mergeFrom(value);
+        }
+        if (y_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder clearY() {
+        bitField0_ = (bitField0_ & ~0x00000002);
+        y_ = null;
+        if (yBuilder_ != null) {
+          yBuilder_.dispose();
+          yBuilder_ = null;
+        }
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+          getYBuilder() {
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return getYFieldBuilder().getBuilder();
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+          getYOrBuilder() {
+        if (yBuilder_ != null) {
+          return yBuilder_.getMessageOrBuilder();
+        } else {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          getYFieldBuilder() {
+        if (yBuilder_ == null) {
+          yBuilder_ =
+              new com.google.protobuf.SingleFieldBuilderV3<
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>(
+                  getY(), getParentForChildren(), isClean());
+          y_ = null;
+        }
+        return yBuilder_;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.TestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.TestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<TestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<TestMessage>() {
+          @java.lang.Override
+          public TestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            Builder builder = newBuilder();
+            try {
+              builder.mergeFrom(input, extensionRegistry);
+            } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+              throw e.setUnfinishedMessage(builder.buildPartial());
+            } catch (com.google.protobuf.UninitializedMessageException e) {
+              throw e.asInvalidProtocolBufferException()
+                  .setUnfinishedMessage(builder.buildPartial());
+            } catch (java.io.IOException e) {
+              throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                  .setUnfinishedMessage(builder.buildPartial());
+            }
+            return builder.buildPartial();
+          }
+        };
+
+    public static com.google.protobuf.Parser<TestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<TestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  public interface NestedTestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.NestedTestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    java.util.List<java.lang.Integer> getZList();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    int getZCount();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    int getZ(int index);
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+  public static final class NestedTestMessage extends com.google.protobuf.GeneratedMessageV3
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.NestedTestMessage)
+      NestedTestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use NestedTestMessage.newBuilder() to construct.
+    private NestedTestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+
+    private NestedTestMessage() {
+      z_ = emptyIntList();
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new NestedTestMessage();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+    }
+
+    public static final int Z_FIELD_NUMBER = 1;
+
+    @SuppressWarnings("serial")
+    private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    @java.lang.Override
+    public java.util.List<java.lang.Integer> getZList() {
+      return z_;
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    public int getZCount() {
+      return z_.size();
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    public int getZ(int index) {
+      return z_.getInt(index);
+    }
+
+    private int zMemoizedSerializedSize = -1;
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      getSerializedSize();
+      if (getZList().size() > 0) {
+        output.writeUInt32NoTag(10);
+        output.writeUInt32NoTag(zMemoizedSerializedSize);
+      }
+      for (int i = 0; i < z_.size(); i++) {
+        output.writeInt32NoTag(z_.getInt(i));
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      {
+        int dataSize = 0;
+        for (int i = 0; i < z_.size(); i++) {
+          dataSize += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(z_.getInt(i));
+        }
+        size += dataSize;
+        if (!getZList().isEmpty()) {
+          size += 1;
+          size += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(dataSize);
+        }
+        zMemoizedSerializedSize = dataSize;
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) obj;
+
+      if (!getZList().equals(other.getZList())) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      if (getZCount() > 0) {
+        hash = (37 * hash) + Z_FIELD_NUMBER;
+        hash = (53 * hash) + getZList().hashCode();
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(
+            java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.NestedTestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+      }
+
+      // Construct using
+      // legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder()
+      private Builder() {}
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        z_ = emptyIntList();
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+            .getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage(this);
+        if (bitField0_ != 0) {
+          buildPartial0(result);
+        }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          z_.makeImmutable();
+          result.z_ = z_;
+        }
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) {
+          return mergeFrom(
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                .getDefaultInstance()) return this;
+        if (!other.z_.isEmpty()) {
+          if (z_.isEmpty()) {
+            z_ = other.z_;
+            z_.makeImmutable();
+            bitField0_ |= 0x00000001;
+          } else {
+            ensureZIsMutable();
+            z_.addAll(other.z_);
+          }
+          onChanged();
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 8:
+                {
+                  int v = input.readInt32();
+                  ensureZIsMutable();
+                  z_.addInt(v);
+                  break;
+                } // case 8
+              case 10:
+                {
+                  int length = input.readRawVarint32();
+                  int limit = input.pushLimit(length);
+                  ensureZIsMutable();
+                  while (input.getBytesUntilLimit() > 0) {
+                    z_.addInt(input.readInt32());
+                  }
+                  input.popLimit(limit);
+                  break;
+                } // case 10
+              default:
+                {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+
+      private int bitField0_;
+
+      private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+      private void ensureZIsMutable() {
+        if (!z_.isModifiable()) {
+          z_ = makeMutableCopy(z_);
+        }
+        bitField0_ |= 0x00000001;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return A list containing the z.
+       */
+      public java.util.List<java.lang.Integer> getZList() {
+        z_.makeImmutable();
+        return z_;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return The count of z.
+       */
+      public int getZCount() {
+        return z_.size();
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index of the element to return.
+       * @return The z at the given index.
+       */
+      public int getZ(int index) {
+        return z_.getInt(index);
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index to set the value at.
+       * @param value The z to set.
+       * @return This builder for chaining.
+       */
+      public Builder setZ(int index, int value) {
+
+        ensureZIsMutable();
+        z_.setInt(index, value);
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param value The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addZ(int value) {
+
+        ensureZIsMutable();
+        z_.addInt(value);
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param values The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addAllZ(java.lang.Iterable<? extends java.lang.Integer> values) {
+        ensureZIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, z_);
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearZ() {
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<NestedTestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<NestedTestMessage>() {
+          @java.lang.Override
+          public NestedTestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            Builder builder = newBuilder();
+            try {
+              builder.mergeFrom(input, extensionRegistry);
+            } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+              throw e.setUnfinishedMessage(builder.buildPartial());
+            } catch (com.google.protobuf.UninitializedMessageException e) {
+              throw e.asInvalidProtocolBufferException()
+                  .setUnfinishedMessage(builder.buildPartial());
+            } catch (java.io.IOException e) {
+              throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                  .setUnfinishedMessage(builder.buildPartial());
+            }
+            return builder.buildPartial();
+          }
+        };
+
+    public static com.google.protobuf.Parser<NestedTestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<NestedTestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable;
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
+    return descriptor;
+  }
+
+  private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
+
+  static {
+    java.lang.String[] descriptorData = {
+      "\n\031proto3_gencode_test.proto\022\032legacy_genc"
+          + "ode_test.proto3\"R\n\013TestMessage\022\t\n\001x\030\002 \001("
+          + "\t\0228\n\001y\030\003 \001(\0132-.legacy_gencode_test.proto"
+          + "3.NestedTestMessage\"\036\n\021NestedTestMessage"
+          + "\022\t\n\001z\030\001 \003(\005B\030B\026Proto3GencodeTestProtob\006p"
+          + "roto3"
+    };
+    descriptor =
+        com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
+            descriptorData, new com.google.protobuf.Descriptors.FileDescriptor[] {});
+    internal_static_legacy_gencode_test_proto3_TestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(0);
+    internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_TestMessage_descriptor,
+            new java.lang.String[] {
+              "X", "Y",
+            });
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(1);
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor,
+            new java.lang.String[] {
+              "Z",
+            });
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}
diff --git a/compatibility/smoke/v26.0/BUILD.bazel b/compatibility/smoke/v26.0/BUILD.bazel
new file mode 100644
index 0000000000000..599ca4733284a
--- /dev/null
+++ b/compatibility/smoke/v26.0/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@rules_java//java:java_library.bzl", "java_library")
+
+java_library(
+    name = "checked_in_gencode",
+    srcs = glob(["**/*.java"]),
+    visibility = ["//compatibility:__subpackages__"],
+    deps = ["//:protobuf_java"],
+)
diff --git a/compatibility/smoke/v26.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java b/compatibility/smoke/v26.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
new file mode 100644
index 0000000000000..ef633163ec6e8
--- /dev/null
+++ b/compatibility/smoke/v26.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
@@ -0,0 +1,1450 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: proto3_gencode_test.proto
+// Protobuf Java Version: 4.26.0
+
+package legacy_gencode_test.proto3;
+
+public final class Proto3GencodeTestProto {
+  private Proto3GencodeTestProto() {}
+
+  static {
+    com.google.protobuf.RuntimeVersion.validateProtobufGencodeVersion(
+        com.google.protobuf.RuntimeVersion.RuntimeDomain.PUBLIC,
+        /* major= */ 4,
+        /* minor= */ 26,
+        /* patch= */ 0,
+        /* suffix= */ "",
+        Proto3GencodeTestProto.class.getName());
+  }
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+
+  public interface TestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.TestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    java.lang.String getX();
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    com.google.protobuf.ByteString getXBytes();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    boolean hasY();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY();
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder getYOrBuilder();
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+  public static final class TestMessage extends com.google.protobuf.GeneratedMessage
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.TestMessage)
+      TestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    static {
+      com.google.protobuf.RuntimeVersion.validateProtobufGencodeVersion(
+          com.google.protobuf.RuntimeVersion.RuntimeDomain.PUBLIC,
+          /* major= */ 4,
+          /* minor= */ 26,
+          /* patch= */ 0,
+          /* suffix= */ "",
+          TestMessage.class.getName());
+    }
+
+    // Use TestMessage.newBuilder() to construct.
+    private TestMessage(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      super(builder);
+    }
+
+    private TestMessage() {
+      x_ = "";
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+    }
+
+    private int bitField0_;
+    public static final int X_FIELD_NUMBER = 2;
+
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object x_ = "";
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    @java.lang.Override
+    public java.lang.String getX() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        x_ = s;
+        return s;
+      }
+    }
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString getXBytes() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        x_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int Y_FIELD_NUMBER = 3;
+    private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    @java.lang.Override
+    public boolean hasY() {
+      return ((bitField0_ & 0x00000001) != 0);
+    }
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+        getYOrBuilder() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      if (!com.google.protobuf.GeneratedMessage.isStringEmpty(x_)) {
+        com.google.protobuf.GeneratedMessage.writeString(output, 2, x_);
+      }
+      if (((bitField0_ & 0x00000001) != 0)) {
+        output.writeMessage(3, getY());
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!com.google.protobuf.GeneratedMessage.isStringEmpty(x_)) {
+        size += com.google.protobuf.GeneratedMessage.computeStringSize(2, x_);
+      }
+      if (((bitField0_ & 0x00000001) != 0)) {
+        size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getY());
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) obj;
+
+      if (!getX().equals(other.getX())) return false;
+      if (hasY() != other.hasY()) return false;
+      if (hasY()) {
+        if (!getY().equals(other.getY())) return false;
+      }
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + X_FIELD_NUMBER;
+      hash = (53 * hash) + getX().hashCode();
+      if (hasY()) {
+        hash = (37 * hash) + Y_FIELD_NUMBER;
+        hash = (53 * hash) + getY().hashCode();
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+    public static final class Builder extends com.google.protobuf.GeneratedMessage.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.TestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+      }
+
+      // Construct using legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
+          getYFieldBuilder();
+        }
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        x_ = "";
+        y_ = null;
+        if (yBuilder_ != null) {
+          yBuilder_.dispose();
+          yBuilder_ = null;
+        }
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage(this);
+        if (bitField0_ != 0) {
+          buildPartial0(result);
+        }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          result.x_ = x_;
+        }
+        int to_bitField0_ = 0;
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          result.y_ = yBuilder_ == null ? y_ : yBuilder_.build();
+          to_bitField0_ |= 0x00000001;
+        }
+        result.bitField0_ |= to_bitField0_;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) {
+          return mergeFrom((legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance())
+          return this;
+        if (!other.getX().isEmpty()) {
+          x_ = other.x_;
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
+        if (other.hasY()) {
+          mergeY(other.getY());
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 18:
+                {
+                  x_ = input.readStringRequireUtf8();
+                  bitField0_ |= 0x00000001;
+                  break;
+                } // case 18
+              case 26:
+                {
+                  input.readMessage(getYFieldBuilder().getBuilder(), extensionRegistry);
+                  bitField0_ |= 0x00000002;
+                  break;
+                } // case 26
+              default:
+                {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+
+      private int bitField0_;
+
+      private java.lang.Object x_ = "";
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The x.
+       */
+      public java.lang.String getX() {
+        java.lang.Object ref = x_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          x_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The bytes for x.
+       */
+      public com.google.protobuf.ByteString getXBytes() {
+        java.lang.Object ref = x_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b =
+              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+          x_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setX(java.lang.String value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        x_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearX() {
+        x_ = getDefaultInstance().getX();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The bytes for x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setXBytes(com.google.protobuf.ByteString value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        checkByteStringIsUtf8(value);
+        x_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+      private com.google.protobuf.SingleFieldBuilder<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          yBuilder_;
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return Whether the y field is set.
+       */
+      public boolean hasY() {
+        return ((bitField0_ & 0x00000002) != 0);
+      }
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return The y.
+       */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+        if (yBuilder_ == null) {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        } else {
+          return yBuilder_.getMessage();
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          y_ = value;
+        } else {
+          yBuilder_.setMessage(value);
+        }
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+              builderForValue) {
+        if (yBuilder_ == null) {
+          y_ = builderForValue.build();
+        } else {
+          yBuilder_.setMessage(builderForValue.build());
+        }
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder mergeY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (((bitField0_ & 0x00000002) != 0)
+              && y_ != null
+              && y_
+                  != legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                      .getDefaultInstance()) {
+            getYBuilder().mergeFrom(value);
+          } else {
+            y_ = value;
+          }
+        } else {
+          yBuilder_.mergeFrom(value);
+        }
+        if (y_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder clearY() {
+        bitField0_ = (bitField0_ & ~0x00000002);
+        y_ = null;
+        if (yBuilder_ != null) {
+          yBuilder_.dispose();
+          yBuilder_ = null;
+        }
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+          getYBuilder() {
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return getYFieldBuilder().getBuilder();
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+          getYOrBuilder() {
+        if (yBuilder_ != null) {
+          return yBuilder_.getMessageOrBuilder();
+        } else {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      private com.google.protobuf.SingleFieldBuilder<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          getYFieldBuilder() {
+        if (yBuilder_ == null) {
+          yBuilder_ =
+              new com.google.protobuf.SingleFieldBuilder<
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>(
+                  getY(), getParentForChildren(), isClean());
+          y_ = null;
+        }
+        return yBuilder_;
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.TestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.TestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<TestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<TestMessage>() {
+          @java.lang.Override
+          public TestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            Builder builder = newBuilder();
+            try {
+              builder.mergeFrom(input, extensionRegistry);
+            } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+              throw e.setUnfinishedMessage(builder.buildPartial());
+            } catch (com.google.protobuf.UninitializedMessageException e) {
+              throw e.asInvalidProtocolBufferException()
+                  .setUnfinishedMessage(builder.buildPartial());
+            } catch (java.io.IOException e) {
+              throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                  .setUnfinishedMessage(builder.buildPartial());
+            }
+            return builder.buildPartial();
+          }
+        };
+
+    public static com.google.protobuf.Parser<TestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<TestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  public interface NestedTestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.NestedTestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    java.util.List<java.lang.Integer> getZList();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    int getZCount();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    int getZ(int index);
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+  public static final class NestedTestMessage extends com.google.protobuf.GeneratedMessage
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.NestedTestMessage)
+      NestedTestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    static {
+      com.google.protobuf.RuntimeVersion.validateProtobufGencodeVersion(
+          com.google.protobuf.RuntimeVersion.RuntimeDomain.PUBLIC,
+          /* major= */ 4,
+          /* minor= */ 26,
+          /* patch= */ 0,
+          /* suffix= */ "",
+          NestedTestMessage.class.getName());
+    }
+
+    // Use NestedTestMessage.newBuilder() to construct.
+    private NestedTestMessage(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      super(builder);
+    }
+
+    private NestedTestMessage() {
+      z_ = emptyIntList();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+    }
+
+    public static final int Z_FIELD_NUMBER = 1;
+
+    @SuppressWarnings("serial")
+    private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    @java.lang.Override
+    public java.util.List<java.lang.Integer> getZList() {
+      return z_;
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    public int getZCount() {
+      return z_.size();
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    public int getZ(int index) {
+      return z_.getInt(index);
+    }
+
+    private int zMemoizedSerializedSize = -1;
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      getSerializedSize();
+      if (getZList().size() > 0) {
+        output.writeUInt32NoTag(10);
+        output.writeUInt32NoTag(zMemoizedSerializedSize);
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+      for (int i = 0; i < z_.size(); i++) {
+        output.writeInt32NoTag(z_.getInt(i));
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      {
+        int dataSize = 0;
+        for (int i = 0; i < z_.size(); i++) {
+          dataSize += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(z_.getInt(i));
+        }
+        size += dataSize;
+        if (!getZList().isEmpty()) {
+          size += 1;
+          size += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(dataSize);
+        }
+        zMemoizedSerializedSize = dataSize;
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) obj;
+
+      if (!getZList().equals(other.getZList())) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      if (getZCount() > 0) {
+        hash = (37 * hash) + Z_FIELD_NUMBER;
+        hash = (53 * hash) + getZList().hashCode();
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(
+            java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+    public static final class Builder extends com.google.protobuf.GeneratedMessage.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.NestedTestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+      }
+
+      // Construct using
+      // legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder()
+      private Builder() {}
+
+      private Builder(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+        super(parent);
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        z_ = emptyIntList();
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+            .getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage(this);
+        if (bitField0_ != 0) {
+          buildPartial0(result);
+        }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          z_.makeImmutable();
+          result.z_ = z_;
+        }
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) {
+          return mergeFrom(
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                .getDefaultInstance()) return this;
+        if (!other.z_.isEmpty()) {
+          if (z_.isEmpty()) {
+            z_ = other.z_;
+            z_.makeImmutable();
+            bitField0_ |= 0x00000001;
+          } else {
+            ensureZIsMutable();
+            z_.addAll(other.z_);
+          }
+          onChanged();
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 8:
+                {
+                  int v = input.readInt32();
+                  ensureZIsMutable();
+                  z_.addInt(v);
+                  break;
+                } // case 8
+              case 10:
+                {
+                  int length = input.readRawVarint32();
+                  int limit = input.pushLimit(length);
+                  ensureZIsMutable();
+                  while (input.getBytesUntilLimit() > 0) {
+                    z_.addInt(input.readInt32());
+                  }
+                  input.popLimit(limit);
+                  break;
+                } // case 10
+              default:
+                {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+
+      private int bitField0_;
+
+      private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+      private void ensureZIsMutable() {
+        if (!z_.isModifiable()) {
+          z_ = makeMutableCopy(z_);
+        }
+        bitField0_ |= 0x00000001;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return A list containing the z.
+       */
+      public java.util.List<java.lang.Integer> getZList() {
+        z_.makeImmutable();
+        return z_;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return The count of z.
+       */
+      public int getZCount() {
+        return z_.size();
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index of the element to return.
+       * @return The z at the given index.
+       */
+      public int getZ(int index) {
+        return z_.getInt(index);
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index to set the value at.
+       * @param value The z to set.
+       * @return This builder for chaining.
+       */
+      public Builder setZ(int index, int value) {
+
+        ensureZIsMutable();
+        z_.setInt(index, value);
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param value The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addZ(int value) {
+
+        ensureZIsMutable();
+        z_.addInt(value);
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param values The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addAllZ(java.lang.Iterable<? extends java.lang.Integer> values) {
+        ensureZIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, z_);
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearZ() {
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<NestedTestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<NestedTestMessage>() {
+          @java.lang.Override
+          public NestedTestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            Builder builder = newBuilder();
+            try {
+              builder.mergeFrom(input, extensionRegistry);
+            } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+              throw e.setUnfinishedMessage(builder.buildPartial());
+            } catch (com.google.protobuf.UninitializedMessageException e) {
+              throw e.asInvalidProtocolBufferException()
+                  .setUnfinishedMessage(builder.buildPartial());
+            } catch (java.io.IOException e) {
+              throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                  .setUnfinishedMessage(builder.buildPartial());
+            }
+            return builder.buildPartial();
+          }
+        };
+
+    public static com.google.protobuf.Parser<NestedTestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<NestedTestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessage.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable;
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessage.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
+    return descriptor;
+  }
+
+  private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
+
+  static {
+    java.lang.String[] descriptorData = {
+      "\n\031proto3_gencode_test.proto\022\032legacy_genc"
+          + "ode_test.proto3\"R\n\013TestMessage\022\t\n\001x\030\002 \001("
+          + "\t\0228\n\001y\030\003 \001(\0132-.legacy_gencode_test.proto"
+          + "3.NestedTestMessage\"\036\n\021NestedTestMessage"
+          + "\022\t\n\001z\030\001 \003(\005B\030B\026Proto3GencodeTestProtob\006p"
+          + "roto3"
+    };
+    descriptor =
+        com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
+            descriptorData, new com.google.protobuf.Descriptors.FileDescriptor[] {});
+    internal_static_legacy_gencode_test_proto3_TestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(0);
+    internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessage.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_TestMessage_descriptor,
+            new java.lang.String[] {
+              "X", "Y",
+            });
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(1);
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessage.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor,
+            new java.lang.String[] {
+              "Z",
+            });
+    descriptor.resolveAllFeaturesImmutable();
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}
diff --git a/compatibility/smoke/v3.11.0/BUILD.bazel b/compatibility/smoke/v3.11.0/BUILD.bazel
new file mode 100644
index 0000000000000..599ca4733284a
--- /dev/null
+++ b/compatibility/smoke/v3.11.0/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@rules_java//java:java_library.bzl", "java_library")
+
+java_library(
+    name = "checked_in_gencode",
+    srcs = glob(["**/*.java"]),
+    visibility = ["//compatibility:__subpackages__"],
+    deps = ["//:protobuf_java"],
+)
diff --git a/compatibility/smoke/v3.11.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java b/compatibility/smoke/v3.11.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
new file mode 100644
index 0000000000000..7d3a7a5820ca2
--- /dev/null
+++ b/compatibility/smoke/v3.11.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
@@ -0,0 +1,1551 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: proto3_gencode_test.proto
+
+package legacy_gencode_test.proto3;
+
+public final class Proto3GencodeTestProto {
+  private Proto3GencodeTestProto() {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+
+  public interface TestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.TestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    java.lang.String getX();
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    com.google.protobuf.ByteString getXBytes();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    boolean hasY();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY();
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder getYOrBuilder();
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+  public static final class TestMessage extends com.google.protobuf.GeneratedMessageV3
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.TestMessage)
+      TestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use TestMessage.newBuilder() to construct.
+    private TestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+
+    private TestMessage() {
+      x_ = "";
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new TestMessage();
+    }
+
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+      return this.unknownFields;
+    }
+
+    private TestMessage(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      this();
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 18:
+              {
+                java.lang.String s = input.readStringRequireUtf8();
+
+                x_ = s;
+                break;
+              }
+            case 26:
+              {
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+                    subBuilder = null;
+                if (y_ != null) {
+                  subBuilder = y_.toBuilder();
+                }
+                y_ =
+                    input.readMessage(
+                        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                            .parser(),
+                        extensionRegistry);
+                if (subBuilder != null) {
+                  subBuilder.mergeFrom(y_);
+                  y_ = subBuilder.buildPartial();
+                }
+
+                break;
+              }
+            default:
+              {
+                if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                  done = true;
+                }
+                break;
+              }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+      } finally {
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
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+          .ensureFieldAccessorsInitialized(
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+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
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+     *
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+    public java.lang.String getX() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        x_ = s;
+        return s;
+      }
+    }
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    public com.google.protobuf.ByteString getXBytes() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        x_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int Y_FIELD_NUMBER = 3;
+    private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    public boolean hasY() {
+      return y_ != null;
+    }
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+        getYOrBuilder() {
+      return getY();
+    }
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      if (!getXBytes().isEmpty()) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, x_);
+      }
+      if (y_ != null) {
+        output.writeMessage(3, getY());
+      }
+      unknownFields.writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!getXBytes().isEmpty()) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, x_);
+      }
+      if (y_ != null) {
+        size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getY());
+      }
+      size += unknownFields.getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) obj;
+
+      if (!getX().equals(other.getX())) return false;
+      if (hasY() != other.hasY()) return false;
+      if (hasY()) {
+        if (!getY().equals(other.getY())) return false;
+      }
+      if (!unknownFields.equals(other.unknownFields)) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + X_FIELD_NUMBER;
+      hash = (53 * hash) + getX().hashCode();
+      if (hasY()) {
+        hash = (37 * hash) + Y_FIELD_NUMBER;
+        hash = (53 * hash) + getY().hashCode();
+      }
+      hash = (29 * hash) + unknownFields.hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.TestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+      }
+
+      // Construct using legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        x_ = "";
+
+        if (yBuilder_ == null) {
+          y_ = null;
+        } else {
+          y_ = null;
+          yBuilder_ = null;
+        }
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage(this);
+        result.x_ = x_;
+        if (yBuilder_ == null) {
+          result.y_ = y_;
+        } else {
+          result.y_ = yBuilder_.build();
+        }
+        onBuilt();
+        return result;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) {
+          return mergeFrom((legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance())
+          return this;
+        if (!other.getX().isEmpty()) {
+          x_ = other.x_;
+          onChanged();
+        }
+        if (other.hasY()) {
+          mergeY(other.getY());
+        }
+        this.mergeUnknownFields(other.unknownFields);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage =
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)
+                  e.getUnfinishedMessage();
+          throw e.unwrapIOException();
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+
+      private java.lang.Object x_ = "";
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The x.
+       */
+      public java.lang.String getX() {
+        java.lang.Object ref = x_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          x_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The bytes for x.
+       */
+      public com.google.protobuf.ByteString getXBytes() {
+        java.lang.Object ref = x_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b =
+              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+          x_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setX(java.lang.String value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+
+        x_ = value;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearX() {
+
+        x_ = getDefaultInstance().getX();
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The bytes for x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setXBytes(com.google.protobuf.ByteString value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        checkByteStringIsUtf8(value);
+
+        x_ = value;
+        onChanged();
+        return this;
+      }
+
+      private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          yBuilder_;
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return Whether the y field is set.
+       */
+      public boolean hasY() {
+        return yBuilder_ != null || y_ != null;
+      }
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return The y.
+       */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+        if (yBuilder_ == null) {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        } else {
+          return yBuilder_.getMessage();
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          y_ = value;
+          onChanged();
+        } else {
+          yBuilder_.setMessage(value);
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+              builderForValue) {
+        if (yBuilder_ == null) {
+          y_ = builderForValue.build();
+          onChanged();
+        } else {
+          yBuilder_.setMessage(builderForValue.build());
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder mergeY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (y_ != null) {
+            y_ =
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder(y_)
+                    .mergeFrom(value)
+                    .buildPartial();
+          } else {
+            y_ = value;
+          }
+          onChanged();
+        } else {
+          yBuilder_.mergeFrom(value);
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder clearY() {
+        if (yBuilder_ == null) {
+          y_ = null;
+          onChanged();
+        } else {
+          y_ = null;
+          yBuilder_ = null;
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+          getYBuilder() {
+
+        onChanged();
+        return getYFieldBuilder().getBuilder();
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+          getYOrBuilder() {
+        if (yBuilder_ != null) {
+          return yBuilder_.getMessageOrBuilder();
+        } else {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          getYFieldBuilder() {
+        if (yBuilder_ == null) {
+          yBuilder_ =
+              new com.google.protobuf.SingleFieldBuilderV3<
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>(
+                  getY(), getParentForChildren(), isClean());
+          y_ = null;
+        }
+        return yBuilder_;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.TestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.TestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<TestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<TestMessage>() {
+          @java.lang.Override
+          public TestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            return new TestMessage(input, extensionRegistry);
+          }
+        };
+
+    public static com.google.protobuf.Parser<TestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<TestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  public interface NestedTestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.NestedTestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    java.util.List<java.lang.Integer> getZList();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    int getZCount();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    int getZ(int index);
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+  public static final class NestedTestMessage extends com.google.protobuf.GeneratedMessageV3
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.NestedTestMessage)
+      NestedTestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use NestedTestMessage.newBuilder() to construct.
+    private NestedTestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+
+    private NestedTestMessage() {
+      z_ = emptyIntList();
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new NestedTestMessage();
+    }
+
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+      return this.unknownFields;
+    }
+
+    private NestedTestMessage(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      this();
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      int mutable_bitField0_ = 0;
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 8:
+              {
+                if (!((mutable_bitField0_ & 0x00000001) != 0)) {
+                  z_ = newIntList();
+                  mutable_bitField0_ |= 0x00000001;
+                }
+                z_.addInt(input.readInt32());
+                break;
+              }
+            case 10:
+              {
+                int length = input.readRawVarint32();
+                int limit = input.pushLimit(length);
+                if (!((mutable_bitField0_ & 0x00000001) != 0) && input.getBytesUntilLimit() > 0) {
+                  z_ = newIntList();
+                  mutable_bitField0_ |= 0x00000001;
+                }
+                while (input.getBytesUntilLimit() > 0) {
+                  z_.addInt(input.readInt32());
+                }
+                input.popLimit(limit);
+                break;
+              }
+            default:
+              {
+                if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                  done = true;
+                }
+                break;
+              }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+      } finally {
+        if (((mutable_bitField0_ & 0x00000001) != 0)) {
+          z_.makeImmutable(); // C
+        }
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+    }
+
+    public static final int Z_FIELD_NUMBER = 1;
+    private com.google.protobuf.Internal.IntList z_;
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    public java.util.List<java.lang.Integer> getZList() {
+      return z_;
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    public int getZCount() {
+      return z_.size();
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    public int getZ(int index) {
+      return z_.getInt(index);
+    }
+
+    private int zMemoizedSerializedSize = -1;
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      getSerializedSize();
+      if (getZList().size() > 0) {
+        output.writeUInt32NoTag(10);
+        output.writeUInt32NoTag(zMemoizedSerializedSize);
+      }
+      for (int i = 0; i < z_.size(); i++) {
+        output.writeInt32NoTag(z_.getInt(i));
+      }
+      unknownFields.writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      {
+        int dataSize = 0;
+        for (int i = 0; i < z_.size(); i++) {
+          dataSize += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(z_.getInt(i));
+        }
+        size += dataSize;
+        if (!getZList().isEmpty()) {
+          size += 1;
+          size += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(dataSize);
+        }
+        zMemoizedSerializedSize = dataSize;
+      }
+      size += unknownFields.getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) obj;
+
+      if (!getZList().equals(other.getZList())) return false;
+      if (!unknownFields.equals(other.unknownFields)) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      if (getZCount() > 0) {
+        hash = (37 * hash) + Z_FIELD_NUMBER;
+        hash = (53 * hash) + getZList().hashCode();
+      }
+      hash = (29 * hash) + unknownFields.hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(
+            java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.NestedTestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+      }
+
+      // Construct using
+      // legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+            .getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage(this);
+        int from_bitField0_ = bitField0_;
+        if (((bitField0_ & 0x00000001) != 0)) {
+          z_.makeImmutable();
+          bitField0_ = (bitField0_ & ~0x00000001);
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+        result.z_ = z_;
+        onBuilt();
+        return result;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) {
+          return mergeFrom(
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                .getDefaultInstance()) return this;
+        if (!other.z_.isEmpty()) {
+          if (z_.isEmpty()) {
+            z_ = other.z_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureZIsMutable();
+            z_.addAll(other.z_);
+          }
+          onChanged();
+        }
+        this.mergeUnknownFields(other.unknownFields);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage =
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)
+                  e.getUnfinishedMessage();
+          throw e.unwrapIOException();
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+
+      private int bitField0_;
+
+      private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+      private void ensureZIsMutable() {
+        if (!((bitField0_ & 0x00000001) != 0)) {
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+          bitField0_ |= 0x00000001;
+        }
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return A list containing the z.
+       */
+      public java.util.List<java.lang.Integer> getZList() {
+        return ((bitField0_ & 0x00000001) != 0) ? java.util.Collections.unmodifiableList(z_) : z_;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return The count of z.
+       */
+      public int getZCount() {
+        return z_.size();
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index of the element to return.
+       * @return The z at the given index.
+       */
+      public int getZ(int index) {
+        return z_.getInt(index);
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index to set the value at.
+       * @param value The z to set.
+       * @return This builder for chaining.
+       */
+      public Builder setZ(int index, int value) {
+        ensureZIsMutable();
+        z_.setInt(index, value);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param value The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addZ(int value) {
+        ensureZIsMutable();
+        z_.addInt(value);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param values The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addAllZ(java.lang.Iterable<? extends java.lang.Integer> values) {
+        ensureZIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, z_);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearZ() {
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<NestedTestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<NestedTestMessage>() {
+          @java.lang.Override
+          public NestedTestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            return new NestedTestMessage(input, extensionRegistry);
+          }
+        };
+
+    public static com.google.protobuf.Parser<NestedTestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<NestedTestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable;
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
+    return descriptor;
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+
+  private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
+
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+      "\n\031proto3_gencode_test.proto\022\032legacy_genc"
+          + "ode_test.proto3\"R\n\013TestMessage\022\t\n\001x\030\002 \001("
+          + "\t\0228\n\001y\030\003 \001(\0132-.legacy_gencode_test.proto"
+          + "3.NestedTestMessage\"\036\n\021NestedTestMessage"
+          + "\022\t\n\001z\030\001 \003(\005B\030B\026Proto3GencodeTestProtob\006p"
+          + "roto3"
+    };
+    descriptor =
+        com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
+            descriptorData, new com.google.protobuf.Descriptors.FileDescriptor[] {});
+    internal_static_legacy_gencode_test_proto3_TestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(0);
+    internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_TestMessage_descriptor,
+            new java.lang.String[] {
+              "X", "Y",
+            });
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(1);
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor,
+            new java.lang.String[] {
+              "Z",
+            });
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}
diff --git a/compatibility/smoke/v3.20.0/BUILD.bazel b/compatibility/smoke/v3.20.0/BUILD.bazel
new file mode 100644
index 0000000000000..599ca4733284a
--- /dev/null
+++ b/compatibility/smoke/v3.20.0/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@rules_java//java:java_library.bzl", "java_library")
+
+java_library(
+    name = "checked_in_gencode",
+    srcs = glob(["**/*.java"]),
+    visibility = ["//compatibility:__subpackages__"],
+    deps = ["//:protobuf_java"],
+)
diff --git a/compatibility/smoke/v3.20.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java b/compatibility/smoke/v3.20.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
new file mode 100644
index 0000000000000..3f9c4cfbb4a2e
--- /dev/null
+++ b/compatibility/smoke/v3.20.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
@@ -0,0 +1,1561 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: proto3_gencode_test.proto
+
+package legacy_gencode_test.proto3;
+
+public final class Proto3GencodeTestProto {
+  private Proto3GencodeTestProto() {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+
+  public interface TestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.TestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    java.lang.String getX();
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    com.google.protobuf.ByteString getXBytes();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    boolean hasY();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY();
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder getYOrBuilder();
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+  public static final class TestMessage extends com.google.protobuf.GeneratedMessageV3
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.TestMessage)
+      TestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use TestMessage.newBuilder() to construct.
+    private TestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+
+    private TestMessage() {
+      x_ = "";
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new TestMessage();
+    }
+
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+      return this.unknownFields;
+    }
+
+    private TestMessage(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      this();
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 18:
+              {
+                java.lang.String s = input.readStringRequireUtf8();
+
+                x_ = s;
+                break;
+              }
+            case 26:
+              {
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+                    subBuilder = null;
+                if (y_ != null) {
+                  subBuilder = y_.toBuilder();
+                }
+                y_ =
+                    input.readMessage(
+                        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                            .parser(),
+                        extensionRegistry);
+                if (subBuilder != null) {
+                  subBuilder.mergeFrom(y_);
+                  y_ = subBuilder.buildPartial();
+                }
+
+                break;
+              }
+            default:
+              {
+                if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                  done = true;
+                }
+                break;
+              }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+      } finally {
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+    }
+
+    public static final int X_FIELD_NUMBER = 2;
+    private volatile java.lang.Object x_;
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    @java.lang.Override
+    public java.lang.String getX() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        x_ = s;
+        return s;
+      }
+    }
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString getXBytes() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        x_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int Y_FIELD_NUMBER = 3;
+    private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    @java.lang.Override
+    public boolean hasY() {
+      return y_ != null;
+    }
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+        getYOrBuilder() {
+      return getY();
+    }
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(x_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, x_);
+      }
+      if (y_ != null) {
+        output.writeMessage(3, getY());
+      }
+      unknownFields.writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(x_)) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, x_);
+      }
+      if (y_ != null) {
+        size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getY());
+      }
+      size += unknownFields.getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) obj;
+
+      if (!getX().equals(other.getX())) return false;
+      if (hasY() != other.hasY()) return false;
+      if (hasY()) {
+        if (!getY().equals(other.getY())) return false;
+      }
+      if (!unknownFields.equals(other.unknownFields)) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + X_FIELD_NUMBER;
+      hash = (53 * hash) + getX().hashCode();
+      if (hasY()) {
+        hash = (37 * hash) + Y_FIELD_NUMBER;
+        hash = (53 * hash) + getY().hashCode();
+      }
+      hash = (29 * hash) + unknownFields.hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.TestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+      }
+
+      // Construct using legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        x_ = "";
+
+        if (yBuilder_ == null) {
+          y_ = null;
+        } else {
+          y_ = null;
+          yBuilder_ = null;
+        }
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage(this);
+        result.x_ = x_;
+        if (yBuilder_ == null) {
+          result.y_ = y_;
+        } else {
+          result.y_ = yBuilder_.build();
+        }
+        onBuilt();
+        return result;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) {
+          return mergeFrom((legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance())
+          return this;
+        if (!other.getX().isEmpty()) {
+          x_ = other.x_;
+          onChanged();
+        }
+        if (other.hasY()) {
+          mergeY(other.getY());
+        }
+        this.mergeUnknownFields(other.unknownFields);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage =
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)
+                  e.getUnfinishedMessage();
+          throw e.unwrapIOException();
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+
+      private java.lang.Object x_ = "";
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The x.
+       */
+      public java.lang.String getX() {
+        java.lang.Object ref = x_;
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+          java.lang.String s = bs.toStringUtf8();
+          x_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The bytes for x.
+       */
+      public com.google.protobuf.ByteString getXBytes() {
+        java.lang.Object ref = x_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b =
+              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+          x_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setX(java.lang.String value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+
+        x_ = value;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearX() {
+
+        x_ = getDefaultInstance().getX();
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The bytes for x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setXBytes(com.google.protobuf.ByteString value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        checkByteStringIsUtf8(value);
+
+        x_ = value;
+        onChanged();
+        return this;
+      }
+
+      private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          yBuilder_;
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return Whether the y field is set.
+       */
+      public boolean hasY() {
+        return yBuilder_ != null || y_ != null;
+      }
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return The y.
+       */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+        if (yBuilder_ == null) {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        } else {
+          return yBuilder_.getMessage();
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          y_ = value;
+          onChanged();
+        } else {
+          yBuilder_.setMessage(value);
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+              builderForValue) {
+        if (yBuilder_ == null) {
+          y_ = builderForValue.build();
+          onChanged();
+        } else {
+          yBuilder_.setMessage(builderForValue.build());
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder mergeY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (y_ != null) {
+            y_ =
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder(y_)
+                    .mergeFrom(value)
+                    .buildPartial();
+          } else {
+            y_ = value;
+          }
+          onChanged();
+        } else {
+          yBuilder_.mergeFrom(value);
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder clearY() {
+        if (yBuilder_ == null) {
+          y_ = null;
+          onChanged();
+        } else {
+          y_ = null;
+          yBuilder_ = null;
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+          getYBuilder() {
+
+        onChanged();
+        return getYFieldBuilder().getBuilder();
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+          getYOrBuilder() {
+        if (yBuilder_ != null) {
+          return yBuilder_.getMessageOrBuilder();
+        } else {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          getYFieldBuilder() {
+        if (yBuilder_ == null) {
+          yBuilder_ =
+              new com.google.protobuf.SingleFieldBuilderV3<
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>(
+                  getY(), getParentForChildren(), isClean());
+          y_ = null;
+        }
+        return yBuilder_;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.TestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.TestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<TestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<TestMessage>() {
+          @java.lang.Override
+          public TestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            return new TestMessage(input, extensionRegistry);
+          }
+        };
+
+    public static com.google.protobuf.Parser<TestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<TestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  public interface NestedTestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.NestedTestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    java.util.List<java.lang.Integer> getZList();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    int getZCount();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    int getZ(int index);
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+  public static final class NestedTestMessage extends com.google.protobuf.GeneratedMessageV3
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.NestedTestMessage)
+      NestedTestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use NestedTestMessage.newBuilder() to construct.
+    private NestedTestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+
+    private NestedTestMessage() {
+      z_ = emptyIntList();
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new NestedTestMessage();
+    }
+
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+      return this.unknownFields;
+    }
+
+    private NestedTestMessage(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      this();
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      int mutable_bitField0_ = 0;
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 8:
+              {
+                if (!((mutable_bitField0_ & 0x00000001) != 0)) {
+                  z_ = newIntList();
+                  mutable_bitField0_ |= 0x00000001;
+                }
+                z_.addInt(input.readInt32());
+                break;
+              }
+            case 10:
+              {
+                int length = input.readRawVarint32();
+                int limit = input.pushLimit(length);
+                if (!((mutable_bitField0_ & 0x00000001) != 0) && input.getBytesUntilLimit() > 0) {
+                  z_ = newIntList();
+                  mutable_bitField0_ |= 0x00000001;
+                }
+                while (input.getBytesUntilLimit() > 0) {
+                  z_.addInt(input.readInt32());
+                }
+                input.popLimit(limit);
+                break;
+              }
+            default:
+              {
+                if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                  done = true;
+                }
+                break;
+              }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+      } finally {
+        if (((mutable_bitField0_ & 0x00000001) != 0)) {
+          z_.makeImmutable(); // C
+        }
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+    }
+
+    public static final int Z_FIELD_NUMBER = 1;
+    private com.google.protobuf.Internal.IntList z_;
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    @java.lang.Override
+    public java.util.List<java.lang.Integer> getZList() {
+      return z_;
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    public int getZCount() {
+      return z_.size();
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    public int getZ(int index) {
+      return z_.getInt(index);
+    }
+
+    private int zMemoizedSerializedSize = -1;
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      getSerializedSize();
+      if (getZList().size() > 0) {
+        output.writeUInt32NoTag(10);
+        output.writeUInt32NoTag(zMemoizedSerializedSize);
+      }
+      for (int i = 0; i < z_.size(); i++) {
+        output.writeInt32NoTag(z_.getInt(i));
+      }
+      unknownFields.writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      {
+        int dataSize = 0;
+        for (int i = 0; i < z_.size(); i++) {
+          dataSize += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(z_.getInt(i));
+        }
+        size += dataSize;
+        if (!getZList().isEmpty()) {
+          size += 1;
+          size += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(dataSize);
+        }
+        zMemoizedSerializedSize = dataSize;
+      }
+      size += unknownFields.getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) obj;
+
+      if (!getZList().equals(other.getZList())) return false;
+      if (!unknownFields.equals(other.unknownFields)) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      if (getZCount() > 0) {
+        hash = (37 * hash) + Z_FIELD_NUMBER;
+        hash = (53 * hash) + getZList().hashCode();
+      }
+      hash = (29 * hash) + unknownFields.hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(
+            java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.NestedTestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+      }
+
+      // Construct using
+      // legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+            .getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage(this);
+        int from_bitField0_ = bitField0_;
+        if (((bitField0_ & 0x00000001) != 0)) {
+          z_.makeImmutable();
+          bitField0_ = (bitField0_ & ~0x00000001);
+        }
+        result.z_ = z_;
+        onBuilt();
+        return result;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) {
+          return mergeFrom(
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                .getDefaultInstance()) return this;
+        if (!other.z_.isEmpty()) {
+          if (z_.isEmpty()) {
+            z_ = other.z_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureZIsMutable();
+            z_.addAll(other.z_);
+          }
+          onChanged();
+        }
+        this.mergeUnknownFields(other.unknownFields);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage =
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)
+                  e.getUnfinishedMessage();
+          throw e.unwrapIOException();
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+
+      private int bitField0_;
+
+      private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+      private void ensureZIsMutable() {
+        if (!((bitField0_ & 0x00000001) != 0)) {
+          z_ = mutableCopy(z_);
+          bitField0_ |= 0x00000001;
+        }
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return A list containing the z.
+       */
+      public java.util.List<java.lang.Integer> getZList() {
+        return ((bitField0_ & 0x00000001) != 0) ? java.util.Collections.unmodifiableList(z_) : z_;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return The count of z.
+       */
+      public int getZCount() {
+        return z_.size();
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index of the element to return.
+       * @return The z at the given index.
+       */
+      public int getZ(int index) {
+        return z_.getInt(index);
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index to set the value at.
+       * @param value The z to set.
+       * @return This builder for chaining.
+       */
+      public Builder setZ(int index, int value) {
+        ensureZIsMutable();
+        z_.setInt(index, value);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param value The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addZ(int value) {
+        ensureZIsMutable();
+        z_.addInt(value);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param values The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addAllZ(java.lang.Iterable<? extends java.lang.Integer> values) {
+        ensureZIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, z_);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearZ() {
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<NestedTestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<NestedTestMessage>() {
+          @java.lang.Override
+          public NestedTestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            return new NestedTestMessage(input, extensionRegistry);
+          }
+        };
+
+    public static com.google.protobuf.Parser<NestedTestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<NestedTestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable;
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
+    return descriptor;
+  }
+
+  private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
+
+  static {
+    java.lang.String[] descriptorData = {
+      "\n\031proto3_gencode_test.proto\022\032legacy_genc"
+          + "ode_test.proto3\"R\n\013TestMessage\022\t\n\001x\030\002 \001("
+          + "\t\0228\n\001y\030\003 \001(\0132-.legacy_gencode_test.proto"
+          + "3.NestedTestMessage\"\036\n\021NestedTestMessage"
+          + "\022\t\n\001z\030\001 \003(\005B\030B\026Proto3GencodeTestProtob\006p"
+          + "roto3"
+    };
+    descriptor =
+        com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
+            descriptorData, new com.google.protobuf.Descriptors.FileDescriptor[] {});
+    internal_static_legacy_gencode_test_proto3_TestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(0);
+    internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_TestMessage_descriptor,
+            new java.lang.String[] {
+              "X", "Y",
+            });
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(1);
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor,
+            new java.lang.String[] {
+              "Z",
+            });
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}
diff --git a/compatibility/smoke/v3.8.0/BUILD.bazel b/compatibility/smoke/v3.8.0/BUILD.bazel
new file mode 100644
index 0000000000000..599ca4733284a
--- /dev/null
+++ b/compatibility/smoke/v3.8.0/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@rules_java//java:java_library.bzl", "java_library")
+
+java_library(
+    name = "checked_in_gencode",
+    srcs = glob(["**/*.java"]),
+    visibility = ["//compatibility:__subpackages__"],
+    deps = ["//:protobuf_java"],
+)
diff --git a/compatibility/smoke/v3.8.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java b/compatibility/smoke/v3.8.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
new file mode 100644
index 0000000000000..21af6fd8479f1
--- /dev/null
+++ b/compatibility/smoke/v3.8.0/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
@@ -0,0 +1,1430 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: proto3_gencode_test.proto
+
+package legacy_gencode_test.proto3;
+
+public final class Proto3GencodeTestProto {
+  private Proto3GencodeTestProto() {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+
+  public interface TestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.TestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /** <code>string x = 2;</code> */
+    java.lang.String getX();
+
+    /** <code>string x = 2;</code> */
+    com.google.protobuf.ByteString getXBytes();
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    boolean hasY();
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY();
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder getYOrBuilder();
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+  public static final class TestMessage extends com.google.protobuf.GeneratedMessageV3
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.TestMessage)
+      TestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use TestMessage.newBuilder() to construct.
+    private TestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
+    }
+
+    private TestMessage() {
+      x_ = "";
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new TestMessage();
+    }
+
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+      return this.unknownFields;
+    }
+
+    private TestMessage(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      this();
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 18:
+              {
+                java.lang.String s = input.readStringRequireUtf8();
+
+                x_ = s;
+                break;
+              }
+            case 26:
+              {
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+                    subBuilder = null;
+                if (y_ != null) {
+                  subBuilder = y_.toBuilder();
+                }
+                y_ =
+                    input.readMessage(
+                        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                            .parser(),
+                        extensionRegistry);
+                if (subBuilder != null) {
+                  subBuilder.mergeFrom(y_);
+                  y_ = subBuilder.buildPartial();
+                }
+
+                break;
+              }
+            default:
+              {
+                if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                  done = true;
+                }
+                break;
+              }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+      } finally {
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+    }
+
+    public static final int X_FIELD_NUMBER = 2;
+    private volatile java.lang.Object x_;
+
+    /** <code>string x = 2;</code> */
+    public java.lang.String getX() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        x_ = s;
+        return s;
+      }
+    }
+
+    /** <code>string x = 2;</code> */
+    public com.google.protobuf.ByteString getXBytes() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        x_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int Y_FIELD_NUMBER = 3;
+    private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    public boolean hasY() {
+      return y_ != null;
+    }
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+        getYOrBuilder() {
+      return getY();
+    }
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      if (!getXBytes().isEmpty()) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, x_);
+      }
+      if (y_ != null) {
+        output.writeMessage(3, getY());
+      }
+      unknownFields.writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!getXBytes().isEmpty()) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, x_);
+      }
+      if (y_ != null) {
+        size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getY());
+      }
+      size += unknownFields.getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) obj;
+
+      if (!getX().equals(other.getX())) return false;
+      if (hasY() != other.hasY()) return false;
+      if (hasY()) {
+        if (!getY().equals(other.getY())) return false;
+      }
+      if (!unknownFields.equals(other.unknownFields)) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + X_FIELD_NUMBER;
+      hash = (53 * hash) + getX().hashCode();
+      if (hasY()) {
+        hash = (37 * hash) + Y_FIELD_NUMBER;
+        hash = (53 * hash) + getY().hashCode();
+      }
+      hash = (29 * hash) + unknownFields.hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.TestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+      }
+
+      // Construct using legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        x_ = "";
+
+        if (yBuilder_ == null) {
+          y_ = null;
+        } else {
+          y_ = null;
+          yBuilder_ = null;
+        }
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage(this);
+        result.x_ = x_;
+        if (yBuilder_ == null) {
+          result.y_ = y_;
+        } else {
+          result.y_ = yBuilder_.build();
+        }
+        onBuilt();
+        return result;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) {
+          return mergeFrom((legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance())
+          return this;
+        if (!other.getX().isEmpty()) {
+          x_ = other.x_;
+          onChanged();
+        }
+        if (other.hasY()) {
+          mergeY(other.getY());
+        }
+        this.mergeUnknownFields(other.unknownFields);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage =
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)
+                  e.getUnfinishedMessage();
+          throw e.unwrapIOException();
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+
+      private java.lang.Object x_ = "";
+
+      /** <code>string x = 2;</code> */
+      public java.lang.String getX() {
+        java.lang.Object ref = x_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          x_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+
+      /** <code>string x = 2;</code> */
+      public com.google.protobuf.ByteString getXBytes() {
+        java.lang.Object ref = x_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b =
+              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+          x_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+
+      /** <code>string x = 2;</code> */
+      public Builder setX(java.lang.String value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+
+        x_ = value;
+        onChanged();
+        return this;
+      }
+
+      /** <code>string x = 2;</code> */
+      public Builder clearX() {
+
+        x_ = getDefaultInstance().getX();
+        onChanged();
+        return this;
+      }
+
+      /** <code>string x = 2;</code> */
+      public Builder setXBytes(com.google.protobuf.ByteString value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        checkByteStringIsUtf8(value);
+
+        x_ = value;
+        onChanged();
+        return this;
+      }
+
+      private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          yBuilder_;
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public boolean hasY() {
+        return yBuilder_ != null || y_ != null;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+        if (yBuilder_ == null) {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        } else {
+          return yBuilder_.getMessage();
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          y_ = value;
+          onChanged();
+        } else {
+          yBuilder_.setMessage(value);
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+              builderForValue) {
+        if (yBuilder_ == null) {
+          y_ = builderForValue.build();
+          onChanged();
+        } else {
+          yBuilder_.setMessage(builderForValue.build());
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder mergeY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (y_ != null) {
+            y_ =
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder(y_)
+                    .mergeFrom(value)
+                    .buildPartial();
+          } else {
+            y_ = value;
+          }
+          onChanged();
+        } else {
+          yBuilder_.mergeFrom(value);
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder clearY() {
+        if (yBuilder_ == null) {
+          y_ = null;
+          onChanged();
+        } else {
+          y_ = null;
+          yBuilder_ = null;
+        }
+
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+          getYBuilder() {
+
+        onChanged();
+        return getYFieldBuilder().getBuilder();
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+          getYOrBuilder() {
+        if (yBuilder_ != null) {
+          return yBuilder_.getMessageOrBuilder();
+        } else {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      private com.google.protobuf.SingleFieldBuilderV3<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          getYFieldBuilder() {
+        if (yBuilder_ == null) {
+          yBuilder_ =
+              new com.google.protobuf.SingleFieldBuilderV3<
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>(
+                  getY(), getParentForChildren(), isClean());
+          y_ = null;
+        }
+        return yBuilder_;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.TestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.TestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<TestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<TestMessage>() {
+          @java.lang.Override
+          public TestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            return new TestMessage(input, extensionRegistry);
+          }
+        };
+
+    public static com.google.protobuf.Parser<TestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<TestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  public interface NestedTestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.NestedTestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /** <code>repeated int32 z = 1;</code> */
+    java.util.List<java.lang.Integer> getZList();
+
+    /** <code>repeated int32 z = 1;</code> */
+    int getZCount();
+
+    /** <code>repeated int32 z = 1;</code> */
+    int getZ(int index);
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+  public static final class NestedTestMessage extends com.google.protobuf.GeneratedMessageV3
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+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.NestedTestMessage)
+      NestedTestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    // Use NestedTestMessage.newBuilder() to construct.
+    private NestedTestMessage(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      super(builder);
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+    private NestedTestMessage() {
+      z_ = emptyIntList();
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+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+      return new NestedTestMessage();
+    }
+
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+      return this.unknownFields;
+    }
+
+    private NestedTestMessage(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      this();
+      if (extensionRegistry == null) {
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+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
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+          switch (tag) {
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+              break;
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+                  z_ = newIntList();
+                  mutable_bitField0_ |= 0x00000001;
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+                z_.addInt(input.readInt32());
+                break;
+              }
+            case 10:
+              {
+                int length = input.readRawVarint32();
+                int limit = input.pushLimit(length);
+                if (!((mutable_bitField0_ & 0x00000001) != 0) && input.getBytesUntilLimit() > 0) {
+                  z_ = newIntList();
+                  mutable_bitField0_ |= 0x00000001;
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+                while (input.getBytesUntilLimit() > 0) {
+                  z_.addInt(input.readInt32());
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+                input.popLimit(limit);
+                break;
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+            default:
+              {
+                if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
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+                break;
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+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
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+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
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+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
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+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
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+    /** <code>repeated int32 z = 1;</code> */
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+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
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+      memoizedIsInitialized = 1;
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+      if (size != -1) return size;
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+      {
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+        for (int i = 0; i < z_.size(); i++) {
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+        size += dataSize;
+        if (!getZList().isEmpty()) {
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+        zMemoizedSerializedSize = dataSize;
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+      size += unknownFields.getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
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+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) obj;
+
+      if (!getZList().equals(other.getZList())) return false;
+      if (!unknownFields.equals(other.unknownFields)) return false;
+      return true;
+    }
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+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      if (getZCount() > 0) {
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+        hash = (53 * hash) + getZList().hashCode();
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+      hash = (29 * hash) + unknownFields.hashCode();
+      memoizedHashCode = hash;
+      return hash;
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+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(
+            java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+    public static final class Builder
+        extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.NestedTestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+      }
+
+      // Construct using
+      // legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+            .getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage(this);
+        int from_bitField0_ = bitField0_;
+        if (((bitField0_ & 0x00000001) != 0)) {
+          z_.makeImmutable();
+          bitField0_ = (bitField0_ & ~0x00000001);
+        }
+        result.z_ = z_;
+        onBuilt();
+        return result;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.setField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+
+      @java.lang.Override
+      public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index,
+          java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) {
+          return mergeFrom(
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                .getDefaultInstance()) return this;
+        if (!other.z_.isEmpty()) {
+          if (z_.isEmpty()) {
+            z_ = other.z_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureZIsMutable();
+            z_.addAll(other.z_);
+          }
+          onChanged();
+        }
+        this.mergeUnknownFields(other.unknownFields);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage =
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)
+                  e.getUnfinishedMessage();
+          throw e.unwrapIOException();
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+
+      private int bitField0_;
+
+      private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+      private void ensureZIsMutable() {
+        if (!((bitField0_ & 0x00000001) != 0)) {
+          z_ = mutableCopy(z_);
+          bitField0_ |= 0x00000001;
+        }
+      }
+
+      /** <code>repeated int32 z = 1;</code> */
+      public java.util.List<java.lang.Integer> getZList() {
+        return ((bitField0_ & 0x00000001) != 0) ? java.util.Collections.unmodifiableList(z_) : z_;
+      }
+
+      /** <code>repeated int32 z = 1;</code> */
+      public int getZCount() {
+        return z_.size();
+      }
+
+      /** <code>repeated int32 z = 1;</code> */
+      public int getZ(int index) {
+        return z_.getInt(index);
+      }
+
+      /** <code>repeated int32 z = 1;</code> */
+      public Builder setZ(int index, int value) {
+        ensureZIsMutable();
+        z_.setInt(index, value);
+        onChanged();
+        return this;
+      }
+
+      /** <code>repeated int32 z = 1;</code> */
+      public Builder addZ(int value) {
+        ensureZIsMutable();
+        z_.addInt(value);
+        onChanged();
+        return this;
+      }
+
+      /** <code>repeated int32 z = 1;</code> */
+      public Builder addAllZ(java.lang.Iterable<? extends java.lang.Integer> values) {
+        ensureZIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, z_);
+        onChanged();
+        return this;
+      }
+
+      /** <code>repeated int32 z = 1;</code> */
+      public Builder clearZ() {
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<NestedTestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<NestedTestMessage>() {
+          @java.lang.Override
+          public NestedTestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            return new NestedTestMessage(input, extensionRegistry);
+          }
+        };
+
+    public static com.google.protobuf.Parser<NestedTestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<NestedTestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable;
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
+    return descriptor;
+  }
+
+  private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
+
+  static {
+    java.lang.String[] descriptorData = {
+      "\n\031proto3_gencode_test.proto\022\032legacy_genc"
+          + "ode_test.proto3\"R\n\013TestMessage\022\t\n\001x\030\002 \001("
+          + "\t\0228\n\001y\030\003 \001(\0132-.legacy_gencode_test.proto"
+          + "3.NestedTestMessage\"\036\n\021NestedTestMessage"
+          + "\022\t\n\001z\030\001 \003(\005B\030B\026Proto3GencodeTestProtob\006p"
+          + "roto3"
+    };
+    descriptor =
+        com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
+            descriptorData, new com.google.protobuf.Descriptors.FileDescriptor[] {});
+    internal_static_legacy_gencode_test_proto3_TestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(0);
+    internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_TestMessage_descriptor,
+            new java.lang.String[] {
+              "X", "Y",
+            });
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(1);
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor,
+            new java.lang.String[] {
+              "Z",
+            });
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}
diff --git a/compatibility/smoke/v32.1/BUILD.bazel b/compatibility/smoke/v32.1/BUILD.bazel
new file mode 100644
index 0000000000000..599ca4733284a
--- /dev/null
+++ b/compatibility/smoke/v32.1/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@rules_java//java:java_library.bzl", "java_library")
+
+java_library(
+    name = "checked_in_gencode",
+    srcs = glob(["**/*.java"]),
+    visibility = ["//compatibility:__subpackages__"],
+    deps = ["//:protobuf_java"],
+)
diff --git a/compatibility/smoke/v32.1/legacy_gencode_test/proto3/Proto3GencodeTestProto.java b/compatibility/smoke/v32.1/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
new file mode 100644
index 0000000000000..5e15ec5b99f8e
--- /dev/null
+++ b/compatibility/smoke/v32.1/legacy_gencode_test/proto3/Proto3GencodeTestProto.java
@@ -0,0 +1,1452 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// NO CHECKED-IN PROTOBUF GENCODE
+// source: proto3_gencode_test.proto
+// Protobuf Java Version: 4.32.1
+
+package legacy_gencode_test.proto3;
+
+@com.google.protobuf.Generated
+public final class Proto3GencodeTestProto extends com.google.protobuf.GeneratedFile {
+  private Proto3GencodeTestProto() {}
+
+  static {
+    com.google.protobuf.RuntimeVersion.validateProtobufGencodeVersion(
+        com.google.protobuf.RuntimeVersion.RuntimeDomain.PUBLIC,
+        /* major= */ 4,
+        /* minor= */ 32,
+        /* patch= */ 1,
+        /* suffix= */ "",
+        Proto3GencodeTestProto.class.getName());
+  }
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+
+  public interface TestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.TestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    java.lang.String getX();
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    com.google.protobuf.ByteString getXBytes();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    boolean hasY();
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY();
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder getYOrBuilder();
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+  public static final class TestMessage extends com.google.protobuf.GeneratedMessage
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.TestMessage)
+      TestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    static {
+      com.google.protobuf.RuntimeVersion.validateProtobufGencodeVersion(
+          com.google.protobuf.RuntimeVersion.RuntimeDomain.PUBLIC,
+          /* major= */ 4,
+          /* minor= */ 32,
+          /* patch= */ 1,
+          /* suffix= */ "",
+          TestMessage.class.getName());
+    }
+
+    // Use TestMessage.newBuilder() to construct.
+    private TestMessage(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      super(builder);
+    }
+
+    private TestMessage() {
+      x_ = "";
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+    }
+
+    private int bitField0_;
+    public static final int X_FIELD_NUMBER = 2;
+
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object x_ = "";
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The x.
+     */
+    @java.lang.Override
+    public java.lang.String getX() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        x_ = s;
+        return s;
+      }
+    }
+
+    /**
+     * <code>string x = 2;</code>
+     *
+     * @return The bytes for x.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString getXBytes() {
+      java.lang.Object ref = x_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        x_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int Y_FIELD_NUMBER = 3;
+    private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return Whether the y field is set.
+     */
+    @java.lang.Override
+    public boolean hasY() {
+      return ((bitField0_ & 0x00000001) != 0);
+    }
+
+    /**
+     * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+     *
+     * @return The y.
+     */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+        getYOrBuilder() {
+      return y_ == null
+          ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.getDefaultInstance()
+          : y_;
+    }
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      if (!com.google.protobuf.GeneratedMessage.isStringEmpty(x_)) {
+        com.google.protobuf.GeneratedMessage.writeString(output, 2, x_);
+      }
+      if (((bitField0_ & 0x00000001) != 0)) {
+        output.writeMessage(3, getY());
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!com.google.protobuf.GeneratedMessage.isStringEmpty(x_)) {
+        size += com.google.protobuf.GeneratedMessage.computeStringSize(2, x_);
+      }
+      if (((bitField0_ & 0x00000001) != 0)) {
+        size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getY());
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) obj;
+
+      if (!getX().equals(other.getX())) return false;
+      if (hasY() != other.hasY()) return false;
+      if (hasY()) {
+        if (!getY().equals(other.getY())) return false;
+      }
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + X_FIELD_NUMBER;
+      hash = (53 * hash) + getX().hashCode();
+      if (hasY()) {
+        hash = (37 * hash) + Y_FIELD_NUMBER;
+        hash = (53 * hash) + getY().hashCode();
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseDelimitedFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.TestMessage} */
+    public static final class Builder extends com.google.protobuf.GeneratedMessage.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.TestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.Builder.class);
+      }
+
+      // Construct using legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
+          internalGetYFieldBuilder();
+        }
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        x_ = "";
+        y_ = null;
+        if (yBuilder_ != null) {
+          yBuilder_.dispose();
+          yBuilder_ = null;
+        }
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage(this);
+        if (bitField0_ != 0) {
+          buildPartial0(result);
+        }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          result.x_ = x_;
+        }
+        int to_bitField0_ = 0;
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          result.y_ = yBuilder_ == null ? y_ : yBuilder_.build();
+          to_bitField0_ |= 0x00000001;
+        }
+        result.bitField0_ |= to_bitField0_;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) {
+          return mergeFrom((legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage.getDefaultInstance())
+          return this;
+        if (!other.getX().isEmpty()) {
+          x_ = other.x_;
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
+        if (other.hasY()) {
+          mergeY(other.getY());
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 18:
+                {
+                  x_ = input.readStringRequireUtf8();
+                  bitField0_ |= 0x00000001;
+                  break;
+                } // case 18
+              case 26:
+                {
+                  input.readMessage(internalGetYFieldBuilder().getBuilder(), extensionRegistry);
+                  bitField0_ |= 0x00000002;
+                  break;
+                } // case 26
+              default:
+                {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+
+      private int bitField0_;
+
+      private java.lang.Object x_ = "";
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The x.
+       */
+      public java.lang.String getX() {
+        java.lang.Object ref = x_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          x_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return The bytes for x.
+       */
+      public com.google.protobuf.ByteString getXBytes() {
+        java.lang.Object ref = x_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b =
+              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+          x_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setX(java.lang.String value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        x_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearX() {
+        x_ = getDefaultInstance().getX();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>string x = 2;</code>
+       *
+       * @param value The bytes for x to set.
+       * @return This builder for chaining.
+       */
+      public Builder setXBytes(com.google.protobuf.ByteString value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        checkByteStringIsUtf8(value);
+        x_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      private legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage y_;
+      private com.google.protobuf.SingleFieldBuilder<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          yBuilder_;
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return Whether the y field is set.
+       */
+      public boolean hasY() {
+        return ((bitField0_ & 0x00000002) != 0);
+      }
+
+      /**
+       * <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code>
+       *
+       * @return The y.
+       */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage getY() {
+        if (yBuilder_ == null) {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        } else {
+          return yBuilder_.getMessage();
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          y_ = value;
+        } else {
+          yBuilder_.setMessage(value);
+        }
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder setY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+              builderForValue) {
+        if (yBuilder_ == null) {
+          y_ = builderForValue.build();
+        } else {
+          yBuilder_.setMessage(builderForValue.build());
+        }
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder mergeY(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage value) {
+        if (yBuilder_ == null) {
+          if (((bitField0_ & 0x00000002) != 0)
+              && y_ != null
+              && y_
+                  != legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                      .getDefaultInstance()) {
+            getYBuilder().mergeFrom(value);
+          } else {
+            y_ = value;
+          }
+        } else {
+          yBuilder_.mergeFrom(value);
+        }
+        if (y_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public Builder clearY() {
+        bitField0_ = (bitField0_ & ~0x00000002);
+        y_ = null;
+        if (yBuilder_ != null) {
+          yBuilder_.dispose();
+          yBuilder_ = null;
+        }
+        onChanged();
+        return this;
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder
+          getYBuilder() {
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return internalGetYFieldBuilder().getBuilder();
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder
+          getYOrBuilder() {
+        if (yBuilder_ != null) {
+          return yBuilder_.getMessageOrBuilder();
+        } else {
+          return y_ == null
+              ? legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                  .getDefaultInstance()
+              : y_;
+        }
+      }
+
+      /** <code>.legacy_gencode_test.proto3.NestedTestMessage y = 3;</code> */
+      private com.google.protobuf.SingleFieldBuilder<
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>
+          internalGetYFieldBuilder() {
+        if (yBuilder_ == null) {
+          yBuilder_ =
+              new com.google.protobuf.SingleFieldBuilder<
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder,
+                  legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder>(
+                  getY(), getParentForChildren(), isClean());
+          y_ = null;
+        }
+        return yBuilder_;
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.TestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.TestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<TestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<TestMessage>() {
+          @java.lang.Override
+          public TestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            Builder builder = newBuilder();
+            try {
+              builder.mergeFrom(input, extensionRegistry);
+            } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+              throw e.setUnfinishedMessage(builder.buildPartial());
+            } catch (com.google.protobuf.UninitializedMessageException e) {
+              throw e.asInvalidProtocolBufferException()
+                  .setUnfinishedMessage(builder.buildPartial());
+            } catch (java.io.IOException e) {
+              throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                  .setUnfinishedMessage(builder.buildPartial());
+            }
+            return builder.buildPartial();
+          }
+        };
+
+    public static com.google.protobuf.Parser<TestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<TestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.TestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  public interface NestedTestMessageOrBuilder
+      extends
+      // @@protoc_insertion_point(interface_extends:legacy_gencode_test.proto3.NestedTestMessage)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    java.util.List<java.lang.Integer> getZList();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    int getZCount();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    int getZ(int index);
+  }
+
+  /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+  public static final class NestedTestMessage extends com.google.protobuf.GeneratedMessage
+      implements
+      // @@protoc_insertion_point(message_implements:legacy_gencode_test.proto3.NestedTestMessage)
+      NestedTestMessageOrBuilder {
+    private static final long serialVersionUID = 0L;
+
+    static {
+      com.google.protobuf.RuntimeVersion.validateProtobufGencodeVersion(
+          com.google.protobuf.RuntimeVersion.RuntimeDomain.PUBLIC,
+          /* major= */ 4,
+          /* minor= */ 32,
+          /* patch= */ 1,
+          /* suffix= */ "",
+          NestedTestMessage.class.getName());
+    }
+
+    // Use NestedTestMessage.newBuilder() to construct.
+    private NestedTestMessage(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      super(builder);
+    }
+
+    private NestedTestMessage() {
+      z_ = emptyIntList();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return legacy_gencode_test.proto3.Proto3GencodeTestProto
+          .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+              legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+    }
+
+    public static final int Z_FIELD_NUMBER = 1;
+
+    @SuppressWarnings("serial")
+    private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return A list containing the z.
+     */
+    @java.lang.Override
+    public java.util.List<java.lang.Integer> getZList() {
+      return z_;
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @return The count of z.
+     */
+    public int getZCount() {
+      return z_.size();
+    }
+
+    /**
+     * <code>repeated int32 z = 1;</code>
+     *
+     * @param index The index of the element to return.
+     * @return The z at the given index.
+     */
+    public int getZ(int index) {
+      return z_.getInt(index);
+    }
+
+    private int zMemoizedSerializedSize = -1;
+
+    private byte memoizedIsInitialized = -1;
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
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+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+      getSerializedSize();
+      if (getZList().size() > 0) {
+        output.writeUInt32NoTag(10);
+        output.writeUInt32NoTag(zMemoizedSerializedSize);
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+      for (int i = 0; i < z_.size(); i++) {
+        output.writeInt32NoTag(z_.getInt(i));
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      {
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+        for (int i = 0; i < z_.size(); i++) {
+          dataSize += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(z_.getInt(i));
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+        size += dataSize;
+        if (!getZList().isEmpty()) {
+          size += 1;
+          size += com.google.protobuf.CodedOutputStream.computeInt32SizeNoTag(dataSize);
+        }
+        zMemoizedSerializedSize = dataSize;
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+        return true;
+      }
+      if (!(obj instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage)) {
+        return super.equals(obj);
+      }
+      legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other =
+          (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) obj;
+
+      if (!getZList().equals(other.getZList())) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      if (getZCount() > 0) {
+        hash = (37 * hash) + Z_FIELD_NUMBER;
+        hash = (53 * hash) + getZList().hashCode();
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        parseDelimitedFrom(
+            java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessage.parseWithIOException(
+          PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() {
+      return newBuilder();
+    }
+
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+
+    public static Builder newBuilder(
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+
+    /** Protobuf type {@code legacy_gencode_test.proto3.NestedTestMessage} */
+    public static final class Builder extends com.google.protobuf.GeneratedMessage.Builder<Builder>
+        implements
+        // @@protoc_insertion_point(builder_implements:legacy_gencode_test.proto3.NestedTestMessage)
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessageOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.class,
+                legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.Builder.class);
+      }
+
+      // Construct using
+      // legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage.newBuilder()
+      private Builder() {}
+
+      private Builder(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+        super(parent);
+      }
+
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        z_ = emptyIntList();
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto
+            .internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+          getDefaultInstanceForType() {
+        return legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+            .getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage build() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage buildPartial() {
+        legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result =
+            new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage(this);
+        if (bitField0_ != 0) {
+          buildPartial0(result);
+        }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          z_.makeImmutable();
+          result.z_ = z_;
+        }
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) {
+          return mergeFrom(
+              (legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage) other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(
+          legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage other) {
+        if (other
+            == legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+                .getDefaultInstance()) return this;
+        if (!other.z_.isEmpty()) {
+          if (z_.isEmpty()) {
+            z_ = other.z_;
+            z_.makeImmutable();
+            bitField0_ |= 0x00000001;
+          } else {
+            ensureZIsMutable();
+            z_.addAll(other.z_);
+          }
+          onChanged();
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 8:
+                {
+                  int v = input.readInt32();
+                  ensureZIsMutable();
+                  z_.addInt(v);
+                  break;
+                } // case 8
+              case 10:
+                {
+                  int length = input.readRawVarint32();
+                  int limit = input.pushLimit(length);
+                  ensureZIsMutable();
+                  while (input.getBytesUntilLimit() > 0) {
+                    z_.addInt(input.readInt32());
+                  }
+                  input.popLimit(limit);
+                  break;
+                } // case 10
+              default:
+                {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+
+      private int bitField0_;
+
+      private com.google.protobuf.Internal.IntList z_ = emptyIntList();
+
+      private void ensureZIsMutable() {
+        if (!z_.isModifiable()) {
+          z_ = makeMutableCopy(z_);
+        }
+        bitField0_ |= 0x00000001;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return A list containing the z.
+       */
+      public java.util.List<java.lang.Integer> getZList() {
+        z_.makeImmutable();
+        return z_;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return The count of z.
+       */
+      public int getZCount() {
+        return z_.size();
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index of the element to return.
+       * @return The z at the given index.
+       */
+      public int getZ(int index) {
+        return z_.getInt(index);
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param index The index to set the value at.
+       * @param value The z to set.
+       * @return This builder for chaining.
+       */
+      public Builder setZ(int index, int value) {
+
+        ensureZIsMutable();
+        z_.setInt(index, value);
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param value The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addZ(int value) {
+
+        ensureZIsMutable();
+        z_.addInt(value);
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @param values The z to add.
+       * @return This builder for chaining.
+       */
+      public Builder addAllZ(java.lang.Iterable<? extends java.lang.Integer> values) {
+        ensureZIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, z_);
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      /**
+       * <code>repeated int32 z = 1;</code>
+       *
+       * @return This builder for chaining.
+       */
+      public Builder clearZ() {
+        z_ = emptyIntList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+
+      // @@protoc_insertion_point(builder_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    }
+
+    // @@protoc_insertion_point(class_scope:legacy_gencode_test.proto3.NestedTestMessage)
+    private static final legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        DEFAULT_INSTANCE;
+
+    static {
+      DEFAULT_INSTANCE = new legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage();
+    }
+
+    public static legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<NestedTestMessage> PARSER =
+        new com.google.protobuf.AbstractParser<NestedTestMessage>() {
+          @java.lang.Override
+          public NestedTestMessage parsePartialFrom(
+              com.google.protobuf.CodedInputStream input,
+              com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+              throws com.google.protobuf.InvalidProtocolBufferException {
+            Builder builder = newBuilder();
+            try {
+              builder.mergeFrom(input, extensionRegistry);
+            } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+              throw e.setUnfinishedMessage(builder.buildPartial());
+            } catch (com.google.protobuf.UninitializedMessageException e) {
+              throw e.asInvalidProtocolBufferException()
+                  .setUnfinishedMessage(builder.buildPartial());
+            } catch (java.io.IOException e) {
+              throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                  .setUnfinishedMessage(builder.buildPartial());
+            }
+            return builder.buildPartial();
+          }
+        };
+
+    public static com.google.protobuf.Parser<NestedTestMessage> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<NestedTestMessage> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public legacy_gencode_test.proto3.Proto3GencodeTestProto.NestedTestMessage
+        getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+  }
+
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_TestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessage.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable;
+  private static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor;
+  private static final com.google.protobuf.GeneratedMessage.FieldAccessorTable
+      internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
+    return descriptor;
+  }
+
+  private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
+
+  static {
+    java.lang.String[] descriptorData = {
+      "\n\031proto3_gencode_test.proto\022\032legacy_genc"
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+          + "\t\0228\n\001y\030\003 \001(\0132-.legacy_gencode_test.proto"
+          + "3.NestedTestMessage\"\036\n\021NestedTestMessage"
+          + "\022\t\n\001z\030\001 \003(\005B\030B\026Proto3GencodeTestProtob\006p"
+          + "roto3"
+    };
+    descriptor =
+        com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
+            descriptorData, new com.google.protobuf.Descriptors.FileDescriptor[] {});
+    internal_static_legacy_gencode_test_proto3_TestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(0);
+    internal_static_legacy_gencode_test_proto3_TestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessage.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_TestMessage_descriptor,
+            new java.lang.String[] {
+              "X", "Y",
+            });
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor =
+        getDescriptor().getMessageTypes().get(1);
+    internal_static_legacy_gencode_test_proto3_NestedTestMessage_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessage.FieldAccessorTable(
+            internal_static_legacy_gencode_test_proto3_NestedTestMessage_descriptor,
+            new java.lang.String[] {
+              "Z",
+            });
+    descriptor.resolveAllFeaturesImmutable();
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}