Fix for loop variable capturing

tests/language/block_scope_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.
 
 foo() => 123;
 
 void testShadowingScope1() {
   var foo = foo();
   Expect.equals(123, foo);
 }
@@ skipping 11 matching lines @@
   {
     var foo = 888;
     f = () => foo;
   }
   var foo = -888;
   Expect.equals(888, f());
 }
 
 void testShadowingCapture2() {
   var f = null;
-  // this one uses a reentrent block
+  // this one uses a reentrant block
   for (int i = 0; i < 2; i++) {
     var foo = i + 888;
     if (f == null) f = () => foo;
-  } while(false);
+  }
   var foo = -888;
 
   // this could break if it doesn't bind the right "foo"
   Expect.equals(888, f());
 }
 
 class BlockScopeTest1 {
   void testShadowingInstanceVar() {
     if (true) {
       var foo = foo() + 444;
@@ skipping 14 matching lines @@
 }
 
 main() {
   testShadowingScope1();
   testShadowingScope2();
   testShadowingCapture1();
   testShadowingCapture2();
   new BlockScopeTest1().testShadowingInstanceVar();
   BlockScopeTest1.testShadowingStatic();
 }