When copying TokenWithComment, use copy of its comments.

pkg/analyzer/test/generated/utilities_test.dart

Index: pkg/analyzer/test/generated/utilities_test.dart
diff --git a/pkg/analyzer/test/generated/utilities_test.dart b/pkg/analyzer/test/generated/utilities_test.dart
index 344612bf6ea46c2fba1aa02e90fd4b2df699b9f7..a4de8c00b94aa0cc535d0f6cd2777ee34179652e 100644
--- a/pkg/analyzer/test/generated/utilities_test.dart
+++ b/pkg/analyzer/test/generated/utilities_test.dart
@@ -59,6 +59,12 @@ class AstCloneComparator extends AstComparator {
       fail('Failed to copy token: ${first.lexeme} (${first.offset})');
       return false;
     }
+    if (first is TokenWithComment) {
+      CommentToken comment = first.precedingComments;
+      if (comment.parent != first) {
+        fail('Failed to link the comment "$comment" with the token "$first".');
+      }
+    }
     return super.isEqualTokens(first, second);
   }
 }
@@ -77,6 +83,13 @@ class AstClonerTest extends EngineTestCase {
     _assertCloneUnitMember('@A.c() main() {}');
   }
 
+  void test_visitAnnotation_withComment() {
+    CompilationUnitMember clazz =
+        _parseUnitMember('/** comment */ @deprecated class A {}');
+    Annotation annotation = clazz.metadata.single;
+    _assertClone(annotation);
+  }
+
   void test_visitArgumentList() {
     _assertCloneExpression('m(a, b)');
   }