Stop using ExecutableElement.localVariables in inference tests.

pkg/analyzer/test/utils.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 analyzer.test.utils;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
+import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/generated/resolver.dart' show TypeProvider;
 import 'package:front_end/src/base/source.dart';
 import 'package:test/test.dart';
 
 /**
+ * Search the [unit] for the [LocalVariableElement] with the given [name].
+ * Fail if there is not exactly one such variable.
+ */
+LocalVariableElement findLocalVariable(CompilationUnit unit, String name) {
+  var finder = new _ElementsByNameFinder(name);
+  unit.accept(finder);
+  List<Element> localVariables =
+      finder.elements.where((e) => e is LocalVariableElement).toList();
+  expect(localVariables, hasLength(1));
+  return localVariables[0];
+}
+
+/**
  * The type of an assertion which asserts properties of [T]s.
  */
 typedef void Asserter<T>(T type);
 
 /**
  * The type of a function which given an [S], builds an assertion over [T]s.
  */
 typedef Asserter<T> AsserterBuilder<S, T>(S arg);
 
 /**
@@ skipping 277 matching lines @@
           Asserter<DartType> argAssert0, Asserter<DartType> argAssert1) =>
       isInstantiationOf(isMap)([argAssert0, argAssert1]);
 
   /**
    * Assert that a type is equal to the [expected].
    */
   Asserter<DartType> isType(DartType expected) => (DartType t) {
         expect(t, expected);
       };
 }
+
+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);
+    }
+  }
+}