diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug781855.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug781855.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// Binary: cache/js-dbg-32-b5ae446888f5-linux
+// Flags: -m -n -a
+//
+
+var Constr = function( ... property)  {};
+Constr.prototype = [];
+var c = new Constr();
+c.push(5);
+gc();
+function enterFunc() {}
+evaluate('enterFunc (c.length);');