Fixes #3363. Hide extensions when import is deferred (#3365)

Author: sgrekhov

LanguageFeatures/Parts-with-imports/resolving_extensions_A01_t01.dart

@@ -17,6 +17,7 @@
 /// @description Check that an extension declared in a part file is available in
 /// its parent file and vice versa.
 /// @author [email protected]
+/// @issue 61804
 
 // SharedOptions=--enable-experiment=enhanced-parts
 

LanguageFeatures/Parts-with-imports/resolving_extensions_A01_t01_part1.dart

@@ -17,6 +17,7 @@
 /// @description Check that an extension declared in a part file is available in
 /// its parent file and vice versa.
 /// @author [email protected]
+/// @issue 61804
 
 // SharedOptions=--enable-experiment=enhanced-parts
 

LanguageFeatures/Parts-with-imports/resolving_extensions_A01_t01_part2.dart

@@ -17,6 +17,7 @@
 /// @description Check that an extension declared in a part file is available in
 /// its parent file and vice versa.
 /// @author [email protected]
+/// @issue 61804
 
 // SharedOptions=--enable-experiment=enhanced-parts
 

LanguageFeatures/Parts-with-imports/resolving_extensions_A01_t03.dart

@@ -17,6 +17,7 @@
 /// @description Check that an extension available by import in a part file is
 /// available in its parts but not available in the parent.
 /// @author [email protected]
+/// @issue 61805
 
 // SharedOptions=--enable-experiment=enhanced-parts
 

LanguageFeatures/Parts-with-imports/resolving_extensions_A01_t03_part1.dart

@@ -17,6 +17,7 @@
 /// @description Check that an extension available by import in a part file is
 /// available in its parts.
 /// @author [email protected]
+/// @issue 61805
 
 // SharedOptions=--enable-experiment=enhanced-parts
 

LanguageFeatures/Parts-with-imports/resolving_extensions_A01_t03_part2.dart

@@ -17,6 +17,7 @@
 /// @description Check that an extension available by import in a part file is
 /// available in its parts.
 /// @author [email protected]
+/// @issue 61805
 
 // SharedOptions=--enable-experiment=enhanced-parts
 

LanguageFeatures/Parts-with-imports/scope_A06_t02.dart

@@ -22,6 +22,7 @@
 /// @description Check that a part file can use the same deferred import prefix
 /// as a prefix that it inherits. In this case it shadows inherited declarations
 /// @author [email protected]
+/// @issue 61806
 
 // SharedOptions=--enable-experiment=enhanced-parts
 

LanguageFeatures/Parts-with-imports/scope_A06_t02_part1.dart

@@ -22,12 +22,13 @@
 /// @description Check that a part file can use the same deferred import prefix
 /// as a prefix that it inherits. In this case it shadows inherited declarations
 /// @author [email protected]
+/// @issue 61806
 
 // SharedOptions=--enable-experiment=enhanced-parts
 
 part of 'scope_A06_t02.dart';
 
-import 'parts_lib.dart' deferred as l;
+import 'parts_lib.dart' deferred as l hide LibExt;
 
 part 'scope_A06_t02_part2.dart';
 
@@ -42,6 +43,5 @@ testPart1() async {
   Expect.equals("LibClass", l.LibClass.id);
   Expect.equals("LibMixin", l.LibMixin.id);
   Expect.equals("LibEnum", l.LibEnum.id);
-  Expect.equals("LibExt", l.LibExt.id);
   Expect.equals("LibET", l.LibET.id);
 }

LanguageFeatures/Parts-with-imports/scope_A06_t02_part2.dart

@@ -22,12 +22,13 @@
 /// @description Check that a part file can use the same deferred import prefix
 /// as a prefix that it inherits. In this case it shadows inherited declarations
 /// @author [email protected]
+/// @issue 61806
 
 // SharedOptions=--enable-experiment=enhanced-parts
 
 part of 'scope_A06_t02_part1.dart';
 
-import 'scope_lib1.dart' deferred as l;
+import 'scope_lib1.dart' deferred as l hide LibExt;
 
 testPart2() async {
   await l.loadLibrary();
@@ -40,7 +41,6 @@ testPart2() async {
   Expect.equals("scope_lib1 LibClass", l.LibClass.id);
   Expect.equals("scope_lib1 LibMixin", l.LibMixin.id);
   Expect.equals("scope_lib1 LibEnum", l.LibEnum.id);
-  Expect.equals("scope_lib1 LibExt", l.LibExt.id);
   Expect.equals("scope_lib1 LibET", l.LibET.id);
   // From parts_lib.dart
   Expect.equals(0, l.counter);

LanguageFeatures/Parts-with-imports/scope_A06_t03_part2.dart

@@ -27,7 +27,7 @@
 
 part of 'scope_A06_t03_part1.dart';
 
-import 'scope_lib1.dart' deferred as l;
+import 'scope_lib1.dart' deferred as l hide LibExt;
 
 testPart2() async {
   // From scope_lib1.dart