diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug678086.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug678086.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+// |jit-test| error:Error
+
+// Binary: cache/js-dbg-64-48e43edc8834-linux
+// Flags:
+//
+
+function f() {
+    frame = dbg.getNewestFrame();
+}
+var g = newGlobal();
+g.f = function (a, b) { return a + "/" + this . f( ) ; };
+var dbg = Debugger(g);
+dbg.onDebuggerStatement = function (frame) {
+    var f = frame.eval("f").return;
+    assertEq(f.call(null, "a", "b").return, "a/b");
+};
+g.eval("debugger;");