Implement .dynamic and throw ObjectNotClosureException in forEach interceptor.

dart/frog/leg/lib/js_helper.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.
 
 #library('js_helper');
 
 #import('coreimpl.dart');
 
 #source('date_helper.dart');
 #source('regexp_helper.dart');
@@ skipping 554 matching lines @@
 builtin$clear$0(receiver) {
   checkNull(receiver);
   if (!isJsArray(receiver)) return UNINTERCEPTED(receiver.clear());
   receiver.length = 0;
 }
 
 builtin$forEach$1(receiver, f) {
   checkNull(receiver);
   if (!isJsArray(receiver)) return UNINTERCEPTED(receiver.forEach(f));
 
+

[kasperl, 2012/02/21 07:18:08]

Too many newlines.

   var length = JS("num", @"$0.length", receiver);
+  if (length > 0 && f === null) throw new ObjectNotClosureException(); // Sigh.

[kasperl, 2012/02/21 07:18:08]

Maybe change 'Sigh' to something more actionable :-)

   for (var i = 0; i < length; i++) {
     f(JS("Object", @"$0[$1]", receiver, i));
   }
 }
 
 builtin$getRange$2(receiver, start, length) {
   checkNull(receiver);
   if (!isJsArray(receiver)) {
     return UNINTERCEPTED(receiver.getRange(start, length));
   }
@@ skipping 560 matching lines @@
 builtin$hashCode$0(receiver) {
   if (receiver is num) return receiver & 0x1FFFFFFF;
   if (receiver is String) {
     throw 'String.hashCode is not implemented';
   }
   if (isJsArray(receiver)) {
     throw 'List.hashCode is not implemented';
   }
   return UNINTERCEPTED(receiver.hashCode());
 }
+
+// TODO(ahe): Dynamic may be overridden.
+builtin$get$dynamic(receiver) => receiver;