diff --git a/js/src/jit-test/tests/basic/bug727921.js b/js/src/jit-test/tests/basic/bug727921.js
new file mode 100644
index 000000000000..88e6773a7dfa
--- /dev/null
+++ b/js/src/jit-test/tests/basic/bug727921.js
@@ -0,0 +1,10 @@
+(function() {
+    let(d) {
+        yield
+    }
+})()
+eval("\
+    (function(){\
+        schedulegc(5), 'a'.replace(/a/,function(){yield})\
+    })\
+")()