1 files changed, 4 insertions, 34 deletions

diff --git a/js/src/builtin/WeakMap.js b/js/src/builtin/WeakMap.js
index 708be8424..6755b7a7b 100644
--- a/js/src/builtin/WeakMap.js
+++ b/js/src/builtin/WeakMap.js
@@ -14,43 +14,13 @@ function WeakMapConstructorInit(iterable) {
     if (!IsCallable(adder))
         ThrowTypeError(JSMSG_NOT_FUNCTION, typeof adder);
 
-    // Step 6.c.
-    var iterFn = iterable[std_iterator];
-    if (!IsCallable(iterFn))
-        ThrowTypeError(JSMSG_NOT_ITERABLE, DecompileArg(0, iterable));
-
-    var iter = callContentFunction(iterFn, iterable);
-    if (!IsObject(iter))
-        ThrowTypeError(JSMSG_NOT_NONNULL_OBJECT, typeof iter);
-
-    // Step 7 (not applicable).
-
-    // Step 8.
-    while (true) {
-        // Step 8.a.
-        var next = callContentFunction(iter.next, iter);
-        if (!IsObject(next))
-            ThrowTypeError(JSMSG_NOT_NONNULL_OBJECT, typeof next);
-
-        // Step 8.b.
-        if (next.done)
-            return;
-
-        // Step 8.c.
-        var nextItem = next.value;
-
+    // Steps 6.c-8.
+    for (var nextItem of allowContentIter(iterable)) {
         // Step 8.d.
-        if (!IsObject(nextItem)) {
-            IteratorCloseThrow(iter);
+        if (!IsObject(nextItem))
             ThrowTypeError(JSMSG_INVALID_MAP_ITERABLE, "WeakMap");
-        }
 
         // Steps 8.e-j.
-        try {
-            callContentFunction(adder, map, nextItem[0], nextItem[1]);
-        } catch (e) {
-            IteratorCloseThrow(iter);
-            throw e;
-        }
+        callContentFunction(adder, map, nextItem[0], nextItem[1]);
     }
 }