Add support for metadata on type variables to Fasta parser.

pkg/compiler/lib/src/parser/member_listener.dart

Index: pkg/compiler/lib/src/parser/member_listener.dart
diff --git a/pkg/compiler/lib/src/parser/member_listener.dart b/pkg/compiler/lib/src/parser/member_listener.dart
index b1684cb1453481ea7859980a5df723ad5af8a664..2c4213e3583bb5429e3738e9b356cf3667ae0514 100644
--- a/pkg/compiler/lib/src/parser/member_listener.dart
+++ b/pkg/compiler/lib/src/parser/member_listener.dart
@@ -155,6 +155,15 @@ class MemberListener extends NodeListener {
   @override
   void endMetadata(Token beginToken, Token periodBeforeName, Token endToken) {
     super.endMetadata(beginToken, periodBeforeName, endToken);
-    pushMetadata(new PartialMetadataAnnotation(beginToken, endToken));
+    // TODO(paulberry,ahe): type variable metadata should not be ignored.  See
+    // dartbug.com/5841.
+    if (!inTypeVariable) {
+      pushMetadata(new PartialMetadataAnnotation(beginToken, endToken));
+    }
+  }
+
+  @override
+  void endTypeVariable(Token token, Token extendsOrSuper) {
+    super.endTypeVariable(token, extendsOrSuper);

[ahe, 2017/03/13 15:36:47]

Is this necessary?

[Paul Berry, 2017/03/13 17:01:08]

Whoops, clearly no.  I'm not sure what I was thinking.  I'll remove this before
committing.

   }
 }