Followup to https://codereview.chromium.org/1450393002/

pkg/fletchc/lib/src/closure_environment.dart

 // Copyright (c) 2015, the Fletch 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.md file.
 
 library fletchc.closure_environment;
 
 import 'package:compiler/src/resolution/semantic_visitor.dart';
 
 import 'package:compiler/src/resolution/operators.dart' show
     AssignmentOperator,
@@ skipping 728 matching lines @@
       FunctionElement indexFunction,
       FunctionElement indexSetFunction,
       Node index,
       IncDecOperator operator,
       _) {
     markThisUsed();
     super.visitSuperIndexPrefix(
         node, indexFunction, indexSetFunction, index, operator, null);
   }
 
-  @override
   void visitTypeAnnotation(TypeAnnotation node) {
-  // This is to avoid the inherited implementation that visits children and
-  // throws when encountering anything unresolved.
+    // TODO(sigurdm): This is to avoid the inherited implementation that visits
+    // children and throws when encountering anything unresolved.
   }
 
   void handleImmutableLocalSet(
       SendSet node,
       LocalElement element,
       Node rhs,
       _) {
     apply(rhs);
   }
 
   void bulkHandleNode(Node node, String message, _) {
   }
 
   void applyInitializers(FunctionExpression initializers, _) {
   }
 
   void applyParameters(NodeList parameters, _) {
   }
 }