Clean up warnings.

sdk/lib/_internal/compiler/implementation/elements/elements.dart

 // Copyright (c) 2012, 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 elements;
 
 import 'dart:uri';
 
 // TODO(ahe): Rename prefix to 'api' when VM bug is fixed.
 import '../../compiler.dart' as api_e;
@@ skipping 1160 matching lines @@
       : super(name, kind, enclosing) {
     assert(modifiers != null);
     defaultImplementation = this;
   }
 
   bool get isPatched => patch != null;
   bool get isPatch => origin != null;
 
   FunctionElement get redirectionTarget {
     if (this == defaultImplementation) return this;
-    Element target = defaultImplementation;
+    var target = defaultImplementation;

[ngeoffray, 2012/11/21 10:22:11]

I can't find which assignment will trigger the warning?

[karlklose, 2012/11/21 11:33:32]

target.defaultImplementation in the loop condition.

     Set<Element> seen = new Set<Element>();
     seen.add(target);
     while (!target.isErroneous() && target != target.defaultImplementation) {
       target = target.defaultImplementation;
       if (seen.contains(target)) {
         // TODO(ahe): This is expedient for now, but it should be
         // checked by the resolver.  Keeping http://dartbug.com/3970
         // open to track this.
         throw new SpannableAssertionFailure(
             target, 'redirecting factory leads to cycle');
@@ skipping 859 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }