Better mangling in frog for fixing parts of issue 1837.

client/tests/client/dom/WindowNSMETest.dart

Index: client/tests/client/dom/WindowNSMETest.dart
===================================================================
--- client/tests/client/dom/WindowNSMETest.dart	(revision 0)
+++ client/tests/client/dom/WindowNSMETest.dart	(revision 0)
@@ -0,0 +1,52 @@
+// 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.
+
+#library('WindowNSMETest');
+#import('../../../testing/unittest/unittest.dart');
+#import('dart:dom', prefix: 'dom');
+
+// Not defined in dom.Window.
+foo(x) => x;
+
+class Unused {
+  foo(x) => 'not $x';
+}
+
+int inscrutable(int x) => x == 0 ? 0 : x | inscrutable(x & (x - 1));
+
+main() {
+  var things = [new Unused(), dom.window];
+
+  test('windowNonMethod', () {
+      var win = things[inscrutable(1)];
+      final message = foo("Hello World");
+      try {
+        String x = win.foo(message);
+        Expect.fail('Should not reach here: $x');
+      } catch (NoSuchMethodException e) {
+        // Expected exception.
+      } catch (Exception e) {
+        Expect.fail('Wrong exception: $e');
+      }
+    });
+
+  test('foo', () {
+      var win = things[inscrutable(0)];
+      String x = win.foo('bar');
+      Expect.equals('not bar', x);
+    });
+
+  // Use dom.window direclty in case the compiler does type inference.
+  test('windowNonMethod2', () {
+      final message = foo("Hello World");
+      try {
+        String x = dom.window.foo(message);
+        Expect.fail('Should not reach here: $x');
+      } catch (NoSuchMethodException e) {
+        // Expected exception.
+      } catch (Exception e) {
+        Expect.fail('Wrong exception: $e');
+      }
+    }); 
+}