Special scope for labelled statements.

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.body_builder;
 
 import '../fasta_codes.dart'
     show FastaMessage, codeExpectedButGot, codeExpectedFunctionBody;
 
 import '../parser/parser.dart' show FormalParameterType, optional;
@@ skipping 2017 matching lines @@
   void handleLabel(Token token) {
     debugEvent("Label");
     Identifier identifier = pop();
     push(new Label(identifier.name));
   }
 
   @override
   void beginLabeledStatement(Token token, int labelCount) {
     debugEvent("beginLabeledStatement");
     List<Label> labels = popList(labelCount);
-    enterLocalScope();
+    enterLocalScope(scope.createNestedLabelScope());
     LabelTarget target =
         new LabelTarget(member, functionNestingLevel, token.charOffset);
     for (Label label in labels) {
       scope.declareLabel(label.name, target);
     }
     push(target);
   }
 
   @override
   void endLabeledStatement(int labelCount) {
@@ skipping 850 matching lines @@
   } else if (node is PrefixBuilder) {
     return node.name;
   } else if (node is ThisAccessor) {
     return node.isSuper ? "super" : "this";
   } else if (node is FastaAccessor) {
     return node.plainNameForRead;
   } else {
     return internalError("Unhandled: ${node.runtimeType}");
   }
 }