diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug928542.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug928542.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+
+called = 0;
+function foo() {
+    this.what();
+    this.random = 0;
+    this.what = 1;
+}
+foo.prototype.what = function() { called = 1; }
+new foo();
+assertEq(called, 1);