Frog now knows about the JS global object, and prevents name collisions with user code.

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 33 matching lines @@
 /**
  * The class [Clock] provides access to a monotonically incrementing clock
  * device.
  */
 class Clock {
   /** 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() native 'return 1000;';
+  static int frequency() => 1000;
 }
 
-void print(Object obj) native '''if (typeof console == 'object') {
+// 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') {
   if (obj) obj = obj.toString();
   console.log(obj);
 } else {
   write(obj);
   write('\n');
 }''' {
   // ensure toString is generated
   obj.toString();
 }
 
@@ skipping 49 matching lines @@
   String toString() native;
 
   // TODO(jmesserly): optimize this. No need to call it.
   get dynamic() => this;
 
   // TODO(jmesserly): add named args. For now stay compatible with the VM.
   noSuchMethod(String name, List args) {
     throw new NoSuchMethodException(this, name, args);
   }
 }