From e9fcd7195798a55252f40ba47194a176d3e31e51 Mon Sep 17 00:00:00 2001
From: "mrbkap%gmail.com" <mrbkap%gmail.com>
Date: Thu, 13 Apr 2006 22:49:56 +0000
Subject: [PATCH] Don't throw when given |for (i in null)| to match
 SpiderMonkey and to match users' expectations. bug 333911, r=brendan

---
 js/narcissus/jsexec.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/js/narcissus/jsexec.js b/js/narcissus/jsexec.js
index 5488b2d42e1..883c747c0b7 100644
--- a/js/narcissus/jsexec.js
+++ b/js/narcissus/jsexec.js
@@ -351,7 +351,10 @@ function execute(n, x) {
             execute(u, x);
         r = n.iterator;
         s = execute(n.object, x);
-        t = toObject(getValue(s), s, n.object);
+        v = getValue(s);
+
+        // ECMA erratum: allow for (i in null)
+        t = v && toObject(v, s, n.object);
         a = [];
         for (i in t)
             a.push(i);