diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug727921.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug727921.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+(function() {
+    let(d) {
+        yield
+    }
+})()
+eval("\
+    (function(){\
+        schedulegc(5), 'a'.replace(/a/,function(){yield})\
+    })\
+")()