diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug576398.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug576398.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+function K(x) {
+  with ({});    // prevent compilation
+  this.x = x; 
+}
+function f() {
+  var a = new K(1);
+  var b = new K(2);
+  return (a == b);
+}
+assertEq(f(), false);