1 files changed, 17 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/for-of/semantics-07.js b/js/src/jit-test/tests/for-of/semantics-07.js
new file mode 100644
index 000000000..eb4a53a80
--- /dev/null
+++ b/js/src/jit-test/tests/for-of/semantics-07.js
@@ -0,0 +1,17 @@
+// Deleting the .next method of an iterator in the middle of a for-of loop
+// causes a TypeError at the next iteration.
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+
+var iterProto = Object.getPrototypeOf([][Symbol.iterator]());
+var s = '';
+assertThrowsInstanceOf(function () {
+    for (var v of ['duck', 'duck', 'duck', 'goose', 'FAIL']) {
+        s += v;
+        if (v === 'goose')
+            delete iterProto.next;
+        s += '.';
+    }
+}, TypeError);
+assertEq(s, 'duck.duck.duck.goose.');