diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug691603.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug691603.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// |jit-test| error: ReferenceError
+function bitsinbyte(b) {
+    while(m<0x100) {    }
+}
+function TimeFunc(func) {
+    for(var y=0; y<256; y++) func(y);
+}
+function nestedExit2() {
+    TimeFunc(bitsinbyte);
+}
+assertEq(nestedExit2(), "ok");