A local may be an unnamed closure. Make sure we emit a name for them.

tests/language/src/UnnamedClosureTest.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.
+
+getNonArray() => new A();
+
+class A {
+  operator[](index) => index;
+}
+
+main() {
+  Expect.equals(42, () {
+    var res;
+    do {
+      var a = getNonArray();
+      res = a[42];
+    } while (false);
+    return res;
+  }());
+}