Fix for resynthesizing with multiply defined names.

pkg/analyzer/test/src/dart/analysis/driver_test.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 analyzer.test.driver;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 987 matching lines @@
     // successfully imports file:///my_pkg/test/d.dart, causing y to have an
     // inferred type of String.
     {
       AnalysisResult result = await driver.getResult(b);
       List<AnalysisError> errors = result.errors;
       expect(errors, hasLength(1));
       expect(errors[0].errorCode, StaticTypeWarningCode.INVALID_ASSIGNMENT);
     }
   }
 
+  test_getResult_nameConflict_local() async {
+    String content = r'''
+foo([p = V]) {}
+V();
+var V;
+''';
+    addTestFile(content);
+    await driver.getResult(testFile);
+  }
+
   test_getResult_noErrors_ifNotAdded() async {
     var a = _p('/test/lib/a.dart');
     provider.newFile(a, 'A a = null;');
 
     AnalysisResult result = await driver.getResult(a);
     expect(result.errors, isEmpty);
   }
 
   test_getResult_notDartFile() async {
     var path = _p('/test/lib/test.txt');
@@ skipping 997 matching lines @@
    * Return the [provider] specific path for the given Posix [path].
    */
   String _p(String path) => provider.convertPath(path);
 
   static String _md5(String content) {
     return hex.encode(md5.convert(UTF8.encode(content)).bytes);
   }
 }
 
 class _SourceMock extends TypedMock implements Source {}