diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug749039.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug749039.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// |jit-test| error: ReferenceError;
+gczeal(4);
+try { jsTestDriverEnd(); } catch(exc1) {}
+evaluate("\
+schedulegc(10);\
+for(var i=0; i<3; i++) {\
+    var obj = { first: 'first', second: 'second' };\
+    for (var elem in obj) {}\
+    x.push(count);\
+}\
+");