cleanup to Value - fix for StringEscapesTest

frog/lib/corelib.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:core");
 #import("dart:coreimpl");
 
 // TODO(jimhug): Better way to map in standard corelib
 #source("../../corelib/src/bool.dart");
 #source("../../corelib/src/collection.dart");
@@ skipping 38 matching lines @@
   /** Returns the current clock tick. */
   static int now() native 'return new Date().getTime();';
 
   /** Returns the frequency of clock ticks in Hz. */
   // TODO(jimhug): Why isn't this a property?
   static int frequency() => 1000;
 }
 
 // TODO(jmesserly): this is working around a name conflict with "window.print".
 void print(Object obj) => _print(obj);
-void _print(Object obj) native '''if (typeof console == 'object') {
+void _print(Object obj) native @'''if (typeof console == 'object') {
   if (obj) obj = obj.toString();
   console.log(obj);
 } else {
   write(obj);
   write('\n');
 }''' {
   // ensure toString is generated
   obj.toString();
 }
 
@@ skipping 68 matching lines @@
 }
 
 ImmutableMap _constMap(List itemsAndKeys) {
   return new ImmutableMap(itemsAndKeys);
 }
 
 void _assert(var test, String text, String url, int line, int column) {
   if (test is Function) test = test();
   if (!test) throw new AssertionError._internal(text, url, line, column);
 }