diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug800179.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug800179.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+// |jit-test| error: TypeError
+
+try {
+    x = []
+    y = function() {}
+    t = Uint8ClampedArray
+    Object.defineProperty(x, 1, {
+        get: (function() {
+            for (v of t) {}
+        })
+    })
+    Object.defineProperty(x, 8, {
+        configurable: t
+    }).reverse()
+} catch (e) {}
+Object.defineProperty([], 1, {
+    configurable: true,
+    get: (function() {
+        for (j = 0; j < 50; ++j) {
+            y()
+        }
+    })
+}).pop()
+x.map(y)