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diff --git a/js/src/builtin/WeakSet.js b/js/src/builtin/WeakSet.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// ES2017 draft rev 0e10c9f29fca1385980c08a7d5e7bb3eb775e2e4
+// 23.4.1.1 WeakSet, steps 6-8
+function WeakSetConstructorInit(iterable) {
+ var set = this;
+
+ // Step 6.a.
+ var adder = set.add;
+
+ // Step 6.b.
+ if (!IsCallable(adder))
+ ThrowTypeError(JSMSG_NOT_FUNCTION, typeof adder);
+
+ // Steps 6.c-8.
+ for (var nextValue of allowContentIter(iterable))
+ callContentFunction(adder, set, nextValue);
+}