Clean up hints

pkg/analyzer/test/generated/resolver_test.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.
 
 library engine.resolver_test;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/context/context.dart' as newContext;
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 12037 matching lines @@
 main() {
   Future<int> bar = null;
   var foo = bar.then(toString);
 }
 ''';
     _resolveTestUnit(code);
 
     SimpleIdentifier identifier = _findIdentifier('foo');
     VariableDeclaration declaration =
         identifier.getAncestor((node) => node is VariableDeclaration);
-    InterfaceType stringType = typeProvider.stringType;
-    InterfaceType futureType = typeProvider.futureType;
-    InterfaceType futureOfStringType =
-        futureType.substitute4(<DartType>[stringType]);
 
     expect(declaration.initializer.staticType.toString(), "Future<String>");
     expect(declaration.initializer.propagatedType, isNull);
   }
 }
 
 @reflectiveTest
 class StrongModeTypePropagationTest extends ResolverTestCase {
   @override
   void setUp() {
@@ skipping 2754 matching lines @@
         // check propagated type
         FunctionType propagatedType = node.propagatedType as FunctionType;
         expect(propagatedType.returnType, test.typeProvider.stringType);
       } on AnalysisException catch (e, stackTrace) {
         thrownException[0] = new CaughtException(e, stackTrace);
       }
     }
     return null;
   }
 }