diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug637010.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug637010.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// Binary: cache/js-dbg-64-d708c2fa7fea-linux
+// Flags:
+//
+var o0 = Iterator.prototype;
+function f0(o) {}
+try {
+  for(var i=0; i<7; i++) {
+    try { o0.prototype(); } catch(e) {
+      if (o0.next() != 7)
+        throw "7 not yielded";
+    };
+  }
+} catch(exc1) {}