Fix cast exception when a Handle gets a wrong element because of name conflict.

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 1410 matching lines @@
   test_getResult_nameConflict_local() async {
     String content = r'''
 foo([p = V]) {}
 V();
 var V;
 ''';
     addTestFile(content);
     await driver.getResult(testFile);
   }
 
+  test_getResult_nameConflict_local_typeInference() async {
+    String content = r'''
+typedef F();
+var F;
+F _ff() => null;
+var f = _ff(); // the inference must fail
+main() {
+  f();
+}
+''';
+    addTestFile(content);
+    await driver.getResult(testFile);
+  }
+
   test_getResult_notDartFile() async {
     var path = _p('/test/lib/test.txt');
     provider.newFile(path, 'class A {}');
 
     AnalysisResult result = await driver.getResult(path);
     expect(result, isNotNull);
     expect(result.unit.element.types.map((e) => e.name), ['A']);
   }
 
   test_getResult_recursiveFlatten() async {
@@ skipping 1250 matching lines @@
     var path = _p('/test.dart');
     expect(() {
       driver.removeFile(path);
     }, throwsStateError);
   }
 
   String _p(String path) => provider.convertPath(path);
 }
 
 class _SourceMock extends TypedMock implements Source {}