We have to create different locals when analyzing a closure. Otherwise the inferrer visitor might t…

tests/language/list_in_closure_test.dart

+// Copyright (c) 2013, 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 dart2js that used to see aborting closure
+// bodies as aborting their enclosing element.
+
+import "package:expect/expect.dart";
+
+main() {
+  var c = () { throw 42; };
+  () {
+    // dart2js would not seen this initialization and therefore think
+    // that the argument passed to a is a list of nulls.
+    var a = [42];
+    foo(a);
+  }();
+}
+
+foo(arg) {
+  Expect.isTrue(arg[0] == 42);
+}