Stop depending of visiting LocalVariableElement(s) in Executableelement.visitChildren().

pkg/analysis_server/test/abstract_single_unit.dart

 // Copyright (c) 2014, 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 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
 import 'package:analyzer/src/dart/error/hint_codes.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:test/test.dart';
 
 import 'abstract_context.dart';
@@ skipping 21 matching lines @@
     return findOffset(search) + search.length;
   }
 
   /**
    * Returns the [SimpleIdentifier] at the given search pattern.
    */
   SimpleIdentifier findIdentifier(String search) {
     return findNodeAtString(search, (node) => node is SimpleIdentifier);
   }
 
+  /**
+   * Search the [testUnit] for the [LocalVariableElement] with the given [name].
+   * Fail if there is not exactly one such variable.
+   */
+  LocalVariableElement findLocalVariable(String name) {
+    var finder = new _ElementsByNameFinder(name);
+    testUnit.accept(finder);
+    List<Element> localVariables =
+        finder.elements.where((e) => e is LocalVariableElement).toList();
+    expect(localVariables, hasLength(1));
+    return localVariables[0];
+  }
+
   AstNode findNodeAtOffset(int offset, [Predicate<AstNode> predicate]) {
     AstNode result = new NodeLocator(offset).searchWithin(testUnit);
     if (result != null && predicate != null) {
       result = result.getAncestor(predicate);
     }
     return result;
   }
 
   AstNode findNodeAtString(String search, [Predicate<AstNode> predicate]) {
     int offset = findOffset(search);
@@ skipping 48 matching lines @@
             error.errorCode != HintCode.UNUSED_ELEMENT &&
             error.errorCode != HintCode.UNUSED_FIELD &&
             error.errorCode != HintCode.UNUSED_IMPORT &&
             error.errorCode != HintCode.UNUSED_LOCAL_VARIABLE;
       }), isEmpty);
     }
     testUnitElement = testUnit.element;
     testLibraryElement = testUnitElement.library;
   }
 }
+
+class _ElementsByNameFinder extends RecursiveAstVisitor<Null> {
+  final String name;
+  final List<Element> elements = [];
+
+  _ElementsByNameFinder(this.name);
+
+  @override
+  visitSimpleIdentifier(SimpleIdentifier node) {
+    if (node.name == name && node.inDeclarationContext()) {
+      elements.add(node.staticElement);
+    }
+  }
+}