Fix regression in JSON serialization of RegExps.

src/date.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 968 matching lines @@
   if (digits == 1) return n;
   return n < MathPow(10, digits - 1) ? '0' + PadInt(n, digits - 1) : n;
 }
 
 
 function DateToISOString() {
   var t = DATE_VALUE(this);
   if (NUMBER_IS_NAN(t)) return kInvalidDate;
   return this.getUTCFullYear() + '-' + PadInt(this.getUTCMonth() + 1, 2) +
       '-' + PadInt(this.getUTCDate(), 2) + 'T' + PadInt(this.getUTCHours(), 2) +
       ':' + PadInt(this.getUTCMinutes(), 2) + ':' + PadInt(this.getUTCSeconds(), 2) +

[Rico, 2010/12/15 07:46:10]

Not your change, but while we are here, there is a long line here

[Lasse Reichstein, 2010/12/15 08:59:54]

Done.

       '.' + PadInt(this.getUTCMilliseconds(), 3) +
       'Z';
 }
 
 
+function CheckJSONPrimitive(val) {
+  if (!IsPrimitive(val))
+    throw MakeTypeError('result_not_primitive', ['toJSON', val]);
+  return val;
+}
+
+
 function DateToJSON(key) {
   return CheckJSONPrimitive(this.toISOString());

[Rico, 2010/12/15 07:46:10]

Two things;
1. If "this" is a custom object, and it has a toISOString method that returns an
object this will throw an error, but it should not. It should only throw an
error if there is no toISOString method.

2. If you agree to the above and change the error message we should delete the
TypeError result_not_primitive since this is the only callsite. Also, we can
delete CheckJSONPrimitive since this is the only place we use it.

[Lasse Reichstein, 2010/12/15 08:59:54]

Rewritten completely, CheckJSONPrimitive removed and result_not_primitive error
message deleted.

 }
 
 
 // -------------------------------------------------------------------
 
 function SetupDate() {
   // Setup non-enumerable properties of the Date object itself.
   InstallFunctions($Date, DONT_ENUM, $Array(
     "UTC", DateUTC,
     "parse", DateParse,
@@ skipping 49 matching lines @@
     "toGMTString", DateToGMTString,
     "toUTCString", DateToUTCString,
     "getYear", DateGetYear,
     "setYear", DateSetYear,
     "toISOString", DateToISOString,
     "toJSON", DateToJSON
   ));
 }
 
 SetupDate();