Handle for-loop with simple break in compile_from_dill_test

pkg/compiler/lib/src/elements/modelx.dart

 // Copyright (c) 2013, 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.modelx;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
 import '../common/resolution.dart' show Resolution, ParsingContext;
 import '../compiler.dart' show Compiler;
@@ skipping 3319 matching lines @@
   UnnamedMixinApplicationElementX(
       String name, ClassElement subclass, int id, this.node)
       : this.subclass = subclass,
         super(name, subclass.compilationUnit, id);
 
   bool get isUnnamedMixinApplication => true;
 
   bool get isAbstract => true;
 }
 
-class LabelDefinitionX implements LabelDefinition<Node> {
+class LabelDefinitionX extends LabelDefinition<Node> {
   final Label label;
   final String labelName;
   final JumpTargetX target;
   bool isBreakTarget = false;
   bool isContinueTarget = false;
 
   LabelDefinitionX(Label label, String labelName, this.target)
       : this.label = label,
         this.labelName = labelName;
 
   // In case of a synthetic label, just use [labelName] for identifying the
   // label.
   String get name => label == null ? labelName : label.identifier.source;
 
   void setBreakTarget() {
     isBreakTarget = true;
     target.isBreakTarget = true;
   }
 
   void setContinueTarget() {
     isContinueTarget = true;
     target.isContinueTarget = true;
   }
 
-  bool get isTarget => isBreakTarget || isContinueTarget;
-
   String toString() => 'Label:${name}';
 }
 
-class JumpTargetX implements JumpTarget<Node> {
+class JumpTargetX extends JumpTarget<Node> {
   final ExecutableElement executableContext;
   final Node statement;
   final int nestingLevel;
   List<LabelDefinition<Node>> labels = <LabelDefinition<Node>>[];
   bool isBreakTarget = false;
   bool isContinueTarget = false;
 
   final int hashCode = ElementX.newHashCode();
 
   JumpTargetX(this.statement, this.nestingLevel, this.executableContext);
 
   @override
   MemberElement get memberContext => executableContext.memberContext;
 
-  String get name => "target";
-
-  bool get isTarget => isBreakTarget || isContinueTarget;
-
   LabelDefinition<Node> addLabel(Label label, String labelName,
       {bool isBreakTarget: false}) {
     LabelDefinitionX result = new LabelDefinitionX(label, labelName, this);
     labels.add(result);
     if (isBreakTarget) {
       result.setBreakTarget();
     }
     return result;
   }
 
@@ skipping 180 matching lines @@
       body = node.asFunctionExpression().body;
     }
     return new ParsedResolvedAst(
         declaration,
         node,
         body,
         definingElement.treeElements,
         definingElement.compilationUnit.script.resourceUri);
   }
 }