Ensure uniqueness of global names.

dart/language/namer_test.dart

Index: dart/language/namer_test.dart
diff --git a/dart/language/namer_test.dart b/dart/language/namer_test.dart
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+// 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.
+
+// Regression test for a bug in dart2js where global names could
+// collide.
+
+var i = 'top level';
+
+var i0 = 'top level zero';
+
+var i00 = 'top level zero zero';
+
+var i2 = 'top level too';
+
+class A {
+  static var i = 'A';
+}
+
+var j = 'top level';
+
+var j0 = 'top level zero';
+
+var j00 = 'top level zero zero';
+
+var j2 = 'top level too';
+
+class B {
+  static var j = 'B';
+}
+
+var k = 'top level';
+
+var k0 = 'top level zero';
+
+var k00 = 'top level zero zero';
+
+var k2 = 'top level too';
+
+class C {
+  static var k = 'C';
+}
+
+main() {
+  // Order matters. This sequence triggered the bug.
+  Expect.equals('top level', i);
+  Expect.equals('A', A.i);
+  Expect.equals('top level too', i2);
+  Expect.equals('top level zero zero', i00);
+  Expect.equals('top level zero', i0);
+
+  Expect.equals('top level zero zero', j00);
+  Expect.equals('top level', j);
+  Expect.equals('top level too', j2);
+  Expect.equals('top level zero', j0);
+  Expect.equals('B', B.j);
+
+  Expect.equals('top level too', k2);
+  Expect.equals('top level zero', k0);
+  Expect.equals('top level', k);
+  Expect.equals('C', C.k);
+  Expect.equals('top level zero zero', k00);
+}