1 files changed, 15 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 0000000000..e89cf1f053
--- /dev/null
+++ b/js/src/jit-test/tests/for-of/semantics-07.js
@@ -0,0 +1,15 @@
+// Deleting the .next method of an iterator in the middle of a for-of loop
+// doesn't cause a TypeError at the next iteration.
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+
+var iterProto = Object.getPrototypeOf([][Symbol.iterator]());
+var s = '';
+for (var v of ['duck', 'duck', 'duck', 'goose', 'and now you\'re it']) {
+    s += v;
+    if (v === 'goose')
+        delete iterProto.next;
+    s += '.';
+}
+assertEq(s, 'duck.duck.duck.goose.and now you\'re it.');