diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug688968.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug688968.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+// Binary: cache/js-dbg-64-fecae145d884-linux
+// Flags: -m -n -a
+//
+
+function foo(x) {
+  x === x--;
+}
+foo(1.2);