More dart2js strong mode cleanup.

pkg/compiler/lib/src/serialization/resolved_ast_serialization.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 dart2js.serialization.resolved_ast;
 
 import 'package:front_end/src/fasta/parser.dart' show Parser, ParserError;
 import 'package:front_end/src/fasta/scanner.dart';
 
 import '../common.dart';
@@ skipping 160 matching lines @@
         serializeLabelDefinition(labelDefinition, list.createObject());
       }
     }
 
     if (element is FunctionElement) {
       serializeParameterNodes(element);
     }
   }
 
   void serializeParameterNodes(FunctionElement function) {
-    function.functionSignature.forEachParameter((ParameterElement parameter) {
+    function.functionSignature.forEachParameter((_parameter) {
+      ParameterElement parameter = _parameter;
       ParameterElement parameterImpl = parameter.implementation;
       // TODO(johnniwinther): Should we support element->node mapping as well?
       getNodeDataEncoder(parameterImpl.node)
           .setElement(PARAMETER_NODE, parameter);
       if (parameter.initializer != null) {
         getNodeDataEncoder(parameterImpl.initializer)
             .setElement(PARAMETER_INITIALIZER, parameter);
       }
     });
   }
@@ skipping 406 matching lines @@
         String labelName = decoder.getString(Key.NAME);
         JumpTarget target = jumpTargets[decoder.getInt(Key.JUMP_TARGET)];
         LabelDefinitionX labelDefinition =
             new LabelDefinitionX(label, labelName, target);
         labelDefinition.isBreakTarget = decoder.getBool(Key.IS_BREAK_TARGET);
         labelDefinition.isContinueTarget =
             decoder.getBool(Key.IS_CONTINUE_TARGET);
         labelDefinitions.add(labelDefinition);
       }
     }
-    jumpTargetLabels.forEach((JumpTargetX jumpTarget, List<int> labelIds) {
+    jumpTargetLabels.forEach((JumpTarget jumpTarget, List<int> labelIds) {
       if (labelIds.isEmpty) return;
       List<LabelDefinition> labels = <LabelDefinition>[];
       for (int labelId in labelIds) {
         labels.add(labelDefinitions[labelId]);
       }
-      jumpTarget.labels = labels;
+      JumpTargetX target = jumpTarget;
+      target.labels = labels;
     });
 
     ListDecoder dataDecoder = objectDecoder.getList(Key.DATA, isOptional: true);
     if (dataDecoder != null) {
       for (int i = 0; i < dataDecoder.length; i++) {
         ObjectDecoder objectDecoder = dataDecoder.getObject(i);
         int id = objectDecoder.getInt(Key.ID);
         Node node = nodeList[id];
         Element nodeElement = deserializeElementReference(
             element, Key.ELEMENT, Key.NAME, objectDecoder,
@@ skipping 82 matching lines @@
         }
       }
     }
     element.resolvedAst =
         new ParsedResolvedAst(element, root, body, elements, uri);
   }
 }
 
 const Key PARAMETER_NODE = const Key('parameter.node');
 const Key PARAMETER_INITIALIZER = const Key('parameter.initializer');