diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug618849.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug618849.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+
+function f() {
+    function g() {
+        var b = x;
+        var c = b++ & b;
+        return c;
+    }
+    var x = x--;
+    return g();
+}
+assertEq(f(), 0);