diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug637205.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug637205.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+// Binary: cache/js-dbg-64-21e90d198613-linux
+// Flags:
+//
+var x  = {};
+function jsTestDriverEnd()
+{
+  for (var optionName in x)
+  {
+  }
+  x = {};
+}
+var o2 = this;
+var o5 = Function.prototype.__proto__;
+function f28(o) {
+var _var_ = o;
+_var_['__proto_'+'_'] = null;
+}
+function _var_(
+ f7) { function f15(o) {
+}
+}
+function f39(o) {
+for(var j=0; j<5; j++) {
+try { o.__proto__ = o2; } catch(e) {}
+}
+}
+for(var i=0; i<11; i++) {
+f39(o5);
+f28(o2);
+}
+jsTestDriverEnd();
+{
+  delete Function;
+}
+jsTestDriverEnd();