test rename overhaul: step 8 - language tests

tests/language/library4_negative_test.dart

 // Copyright (c) 2012, 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.
 
 // This test should fail to load because library1 defines a top-level
 // variable named 'foo' which conflicts with the prefix 'foo' used to import
 // library3.  This is an error even if 'foo' is never referred to.
 
 #library("Library4NegativeTest.dart");
 #import("library1.dart"); // Defines a top-level variable 'foo'
 #import("library3.dart", prefix:"foo"); // Creates prefix 'foo'
 
 main() {
 }