diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug797493.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug797493.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// |jit-test| error:ReferenceError
+
+// Binary: cache/js-dbg-64-13fd49ef7786-linux
+// Flags:
+//
+
+var g = newGlobal();
+var dbg = new Debugger(g);
+dbg.onDebuggerStatement = function handleDebugger(frame) {
+    frame.onPop = function handlePop(c) {
+      poppedFrames.indexOf(this)
+    }
+};
+g.eval("function g() { for (var i = 0; i < 10; i++) { debugger; yield i; } }");
+assertEq(g.eval("var t = 0; for (j in g()) t += j; t;"), 45);