Do not share local function between closurized and non-closurized enclosing

tests/language/src/ImplicitClosure2Test.dart

Index: tests/language/src/ImplicitClosure2Test.dart
===================================================================
--- tests/language/src/ImplicitClosure2Test.dart	(revision 0)
+++ tests/language/src/ImplicitClosure2Test.dart	(revision 0)
@@ -0,0 +1,22 @@
+// 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.
+
+class B {
+  foo(i) => 499 + i;
+}
+
+class A {
+  var b;
+  A() : b = new B();
+
+  foo(i) { return (() => b.foo(i))(); }
+}
+
+main() {
+  var a = new A();
+  Expect.equals(510, a.foo(11));
+  var f = a.foo;
+  Expect.equals(521, f(22));
+}
+