Migrate block 43.

tests/language_2/bad_initializer2_negative_test.dart

 // Copyright (c) 2011, 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.
 // Variable initializer must not reference the initialized variable.
 
 import "package:expect/expect.dart";
 
 class BadInitializer2NegativeTest {
   static testMain() {
     var foo = (int n) {
       if (n == 0) {
         return 0;
       } else {
         return 1 + foo(n - 1); // <-- self-reference to closure foo.
       }
     };
     Expect.equals(4, foo(4));
   }
 }
 
 main() {
   BadInitializer2NegativeTest.testMain();
 }