Parser fix for lambdas

frog/lib/corelib_impl.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.
 
 #library("dart:coreimpl");
 
 #source("../../corelib/src/implementation/dual_pivot_quicksort.dart");
 #source("../../corelib/src/implementation/duration_implementation.dart");
 #source("../../corelib/src/implementation/exceptions.dart");
 #source("../../corelib/src/implementation/future_implementation.dart");
@@ skipping 76 matching lines @@
   ListIterator(List<T> array)
       : _array = array,
         _pos = 0 {
   }
 
   bool hasNext() {
     return _array.length > _pos;
   }
 
   T next() {
+    // TODO(jmesserly): this check is redundant in a for-in loop
+    // Must we do it?
     if (!hasNext()) {
       throw const NoMoreElementsException();
     }
     return _array[_pos++];
   }
 
   final List<T> _array;
   int _pos;
 }
 
@@ skipping 303 matching lines @@
     } else if (isNaN()) {
       if (other.isNaN()) {
         return 0;
       }
       return 1;
     } else {
       return -1;
     }
   }
 }