Fix 2.13 build

Author: alexarchambault

.github/workflows/ci.yml

@@ -55,7 +55,9 @@ jobs:
               "frontend/testOnly bloop.ScalaVersionsSpec" \
               "frontend/testOnly -bloop.ScalaVersionsSpec" \
               "jsBridge06/test" \
-              "jsBridge1/test"
+              "jsBridge1/test" &&\
+          ./bin/sbt-ci.sh \
+            "+test:compile"
         shell: bash
   launcher-test:
     runs-on: ${{ matrix.os }}

bloopgun-core/src/main/scala-2.12/bloop/bloopgun/util/Helper.scala

@@ -0,0 +1,7 @@
+package bloop.bloopgun.util
+
+object Helper {
+  import Ordering.Implicits.seqDerivedOrdering
+  def seqIntOrdering: Ordering[Seq[Int]] =
+    seqDerivedOrdering[Seq, Int]
+}

bloopgun-core/src/main/scala-2.13/bloop/bloopgun/util/Helper.scala

@@ -0,0 +1,7 @@
+package bloop.bloopgun.util
+
+object Helper {
+  import Ordering.Implicits.seqOrdering
+  def seqIntOrdering: Ordering[Seq[Int]] =
+    seqOrdering[Seq, Int]
+}

bloopgun-core/src/main/scala/bloop/bloopgun/Bloopgun.scala

@@ -11,6 +11,7 @@ import bloop.bloopgun.core.AvailableWithCommand
 import bloop.bloopgun.core.ListeningAndAvailableAt
 import bloop.bloopgun.core.ServerStatus
 import bloop.bloopgun.core.ResolvedAt
+import bloop.bloopgun.util.Helper.seqIntOrdering
 import bloopgun.internal.build.BloopgunInfo
 
 import java.io.PrintStream
@@ -521,15 +522,13 @@ class BloopgunCli(
           val jvmOpts = Environment.detectJvmOptionsForServer(found, serverArgs, logger)
           val stringClasspath = classpath.map(_.normalize.toAbsolutePath).mkString(delimiter)
           val isBloopFork = {
-            import Ordering.Implicits.seqDerivedOrdering
             val ver = bloopVersion
               .split('.')
               .toSeq
               .map(s => scala.util.Try(s.toInt).toOption)
               .takeWhile(_.nonEmpty)
               .flatten
-            val ord = seqDerivedOrdering[Seq, Int]
-            ord.compare(ver, Seq(1, 4, 13)) >= 0
+            seqIntOrdering.compare(ver, Seq(1, 4, 13)) >= 0
           }
           val mainClass = if (isBloopFork) "bloop.Bloop" else "bloop.Server"
           val cmd = javaBinary ++ finalJvmOpts(jvmOpts) ++ List(