fix #159, static renames for caller/arguments

lib/runtime/dart_runtime.js

 // Copyright (c) 2015, 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.
 
-var dart, _js_helper;
+var dart, _js_helper, _js_primitives;
 (function (dart) {
   'use strict';
 
   let defineProperty = Object.defineProperty;
   let getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
   let getOwnPropertyNames = Object.getOwnPropertyNames;
   let getOwnPropertySymbols = Object.getOwnPropertySymbols;
 
   function getOwnNamesAndSymbols(obj) {
     return getOwnPropertyNames(obj).concat(getOwnPropertySymbols(obj));
@@ skipping 737 matching lines @@
 
   /**
    * Given a class and an initializer method name, creates a constructor
    * function with the same name. For example `new SomeClass.name(args)`.
    */
   function defineNamedConstructor(clazz, name) {
     let proto = clazz.prototype;
     let initMethod = proto[name];
     let ctor = function() { return initMethod.apply(this, arguments); }
     ctor.prototype = proto;
-    clazz[name] = ctor;
+    defineProperty(clazz, name, { value: ctor, configurable: true });

[Jacob, 2015/04/29 21:53:19]

everything looks fine but not clear why this needs to be a defineProperty call.

[Jennifer Messerly, 2015/04/29 23:07:33]

good call, I'll add a comment :)

   }
   dart.defineNamedConstructor = defineNamedConstructor;
 
   function stackTrace(exception) {
     throw new core.UnimplementedError();
   }
   dart.stackTrace = stackTrace;
 
   /** The Symbol for storing type arguments on a specialized generic type. */
   dart.typeArguments = Symbol('typeArguments');
@@ skipping 156 matching lines @@
   dart.void = { toString() { return 'void'; } };
   dart.bottom = { toString() { return 'bottom'; } };
 
   dart.global = window || global;
   dart.JsSymbol = Symbol;
 
   // TODO(jmesserly): hack to bootstrap the SDK
   _js_helper = _js_helper || {};
   _js_helper.checkNum = notNull;
 
+  _js_primitives = _js_primitives || {};
+  _js_primitives.printString = (s) => console.log(s);
+
 })(dart || (dart = {}));