Get Firefox and IE working again with Object.defineProperty!

frog/gen.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.
 
 /**
  * Top level generator object for writing code and keeping track of
  * dependencies.
  *
  * Should have two compilation models, but only one implemented so far.
  *
@@ skipping 239 matching lines @@
       writeFunction = writer.enterBlock;
       ending = '';
     }
     if (type.isObject) {
       world.counters.objectProtoMembers++;
     }
     if (type.isObject || type.genericType == world.listFactoryType) {
       // We special case these two so that by default we can use "= function()"
       // syntax for better readability.
       if (isOneLiner) {
-        ending = ', enumerable: false, configurable: true })' + ending;
+        ending = ', enumerable: false, writable: true, configurable: true })' +
+            ending;
       }
       writeFunction('Object.defineProperty(${type.jsname}.prototype, "$name",' +
         ' { value: $functionBody$ending');
       if (isOneLiner) return '}';
-      return '}, enumerable: false, configurable: true });';
+      return '}, enumerable: false, writable: true, configurable: true });';
     } else {
       writeFunction(_prototypeOf(type, name) + ' = ' + functionBody + ending);
-      return (!isOneLiner) ? '}' : '';
+      return isOneLiner? '': '}';
     }
   }
 
   _maybeIsTest(Type onType, Type checkType) {
     bool isSubtype = onType.isSubtypeOf(checkType);
     if (checkType.isTested) {
       // TODO(jmesserly): cache these functions? they just return true or false.
       _writePrototypePatch(onType, 'is\$${checkType.jsname}',
           'function(){return $isSubtype}', writer);
     }
@@ skipping 2504 matching lines @@
       result.add(new Value(world.varType, '\$$i', null, /*needsTemp:*/false));
     }
     for (int i = bareCount; i < length; i++) {
       var name = getName(i);
       if (name == null) name = '\$$i';
       result.add(new Value(world.varType, name, null, /*needsTemp:*/false));
     }
     return new Arguments(nodes, result);
   }
 }