diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug666292.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug666292.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+// |jit-test| debug
+
+function f(){
+  this.zzz.zzz;
+  for(let d in []);
+}
+trap(f, 16, '')
+try {
+    f()
+} catch(e) {
+    caught = true;
+    assertEq(""+e, "TypeError: this.zzz is undefined");
+}
+assertEq(caught, true);