Updates for js_array

tool/input_sdk/private/js_helper.dart

 // Copyright (c) 2013, 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._js_helper;
 
 import 'dart:collection';
 
 import 'dart:_foreign_helper' show
     JS,
@@ skipping 529 matching lines @@
 }
 
 throwRuntimeError(message) {
   throw new RuntimeError(message);
 }
 
 throwAbstractClassInstantiationError(className) {
   throw new AbstractClassInstantiationError(className);
 }
 
+
+@NoInline()
+throwConcurrentModificationError(collection) {
+  throw new ConcurrentModificationError(collection);
+}
+
 class NullError extends Error implements NoSuchMethodError {
   final String _message;
   final String _method;
 
   NullError(this._message, match)
       : _method = match == null ? null : JS('', '#.method', match);
 
   String toString() {
     if (_method == null) return 'NullError: $_message';
-    return 'NullError: Cannot call "$_method" on null';
+    return "NullError: method not found: '$_method' on null";
   }
 }
 
 class JsNoSuchMethodError extends Error implements NoSuchMethodError {
   final String _message;
   final String _method;
   final String _receiver;
 
   JsNoSuchMethodError(this._message, match)
       : _method = match == null ? null : JS('String|Null', '#.method', match),
         _receiver =
             match == null ? null : JS('String|Null', '#.receiver', match);
 
   String toString() {
     if (_method == null) return 'NoSuchMethodError: $_message';
     if (_receiver == null) {
-      return 'NoSuchMethodError: Cannot call "$_method" ($_message)';
+      return "NoSuchMethodError: method not found: '$_method' ($_message)";
     }
-    return 'NoSuchMethodError: Cannot call "$_method" on "$_receiver" '
-        '($_message)';
+    return "NoSuchMethodError: "
+        "method not found: '$_method' on '$_receiver' ($_message)";
   }
 }
 
 class UnknownJsTypeError extends Error {
   final String _message;
 
   UnknownJsTypeError(this._message);
 
   String toString() => _message.isEmpty ? 'Error' : 'Error: $_message';
 }
 
 /**
  * Called by generated code to fetch the stack trace from an
  * exception. Should never return null.
  */
 StackTrace getTraceFromException(exception) => new _StackTrace(exception);
 
 class _StackTrace implements StackTrace {
   var _exception;
   String _trace;
   _StackTrace(this._exception);
 
   String toString() {
-    if (_trace != null) return _trace;
+    if (_trace != null) return JS('String', '#', _trace);
 
     String trace;
-    if (JS('bool', 'typeof # === "object"', _exception)) {
+    if (JS('bool', '# !== null', _exception) &&
+        JS('bool', 'typeof # === "object"', _exception)) {
       trace = JS("String|Null", r"#.stack", _exception);
     }
     return _trace = (trace == null) ? '' : trace;
   }
 }
 
 int objectHashCode(var object) {
   if (object == null || JS('bool', "typeof # != 'object'", object)) {
     return object.hashCode;
   } else {
@@ skipping 212 matching lines @@
 
   SyncIterable(this._generator, this._args);
 
   // TODO(jmesserly): this should be [Symbol.iterator]() method. Unfortunately
   // we have no way of telling the compiler yet, so it will generate an extra
   // layer of indirection that wraps the SyncIterator.
   _jsIterator() => JS('', '#(...#)', _generator, _args);
 
   Iterator<E> get iterator => new SyncIterator<E>(_jsIterator());
 }