1 files changed, 11 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/testForInLoopChangeIteratorType.js b/js/src/jit-test/tests/basic/testForInLoopChangeIteratorType.js
new file mode 100644
index 0000000000..0efce83648
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testForInLoopChangeIteratorType.js
@@ -0,0 +1,11 @@
+function testForInLoopChangeIteratorType() {
+    for(y in [0,1,2]) y = NaN;
+    (function(){
+        [].__proto__.u = void 0;
+        for (let y in [5,6,7,8])
+            y = NaN;
+        delete [].__proto__.u;
+    })()
+    return "ok";
+}
+assertEq(testForInLoopChangeIteratorType(), "ok");