Fix the locals lookup of variables and partial implementation of boxing of variables.

pkg/compiler/lib/src/closure.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.
 
 import 'common/names.dart' show Identifiers;
 import 'common/resolution.dart' show ParsingContext, Resolution;
 import 'common/tasks.dart' show CompilerTask, Measurer;
 import 'common.dart';
 import 'compiler.dart' show Compiler;
 import 'constants/expressions.dart';
@@ skipping 1253 matching lines @@
 
     for (LocalVariableElement variable in scopeVariables) {
       // No need to box non-assignable elements.
       if (!variable.isAssignable) continue;
       if (!mutatedVariables.contains(variable)) continue;
       boxCapturedVariable(variable);
     }
     if (!scopeMapping.isEmpty) {
       CapturedScopeImpl scope = new CapturedScopeImpl(box, scopeMapping);
       closureData.capturingScopes[node] = scope;
+      print('adding capturing scope for $node to $closureData');
       assert(closureInfo[node] == null);
       closureInfo[node] = scope;
     }
   }
 
   void inNewScope(Node node, Function action) {
     List<LocalVariableElement> oldScopeVariables = scopeVariables;
     scopeVariables = <LocalVariableElement>[];
     action();
     attachCapturedScopeVariables(node);
@@ skipping 263 matching lines @@
 ///
 /// Move the below classes to a JS model eventually.
 ///
 abstract class JSEntity implements MemberEntity {
   Local get declaredEntity;
 }
 
 abstract class PrivatelyNamedJSEntity implements JSEntity {
   Entity get rootOfScope;
 }