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-rw-r--r--js/src/jit-test/tests/for-of/semantics-06.js8
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diff --git a/js/src/jit-test/tests/for-of/semantics-06.js b/js/src/jit-test/tests/for-of/semantics-06.js
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+++ b/js/src/jit-test/tests/for-of/semantics-06.js
@@ -0,0 +1,8 @@
+// Deleting the .next method makes for-of stop working on arrays.
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+
+var iterProto = Object.getPrototypeOf([][Symbol.iterator]());
+delete iterProto.next;
+assertThrowsInstanceOf(function () { for (var v of []) ; }, TypeError);