1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/for-of/semantics-11.js b/js/src/jit-test/tests/for-of/semantics-11.js
new file mode 100644
index 0000000000..f806478bef
--- /dev/null
+++ b/js/src/jit-test/tests/for-of/semantics-11.js
@@ -0,0 +1,43 @@
+// for-of on a proxy causes a predictable sequence of trap calls.
+
+load(libdir + "iteration.js");
+
+var s = '';
+
+var i = 0;
+var next_fn = new Proxy(function() {}, {
+    apply() {
+        s += "n";
+        if (i == 3)
+            return { value: undefined, done: true };
+        return { value: i++, done: false };
+    }
+});
+
+var it = new Proxy({}, {
+    get(target, property, receiver) {
+        assertEq(property, "next");
+        s += "N";
+        return next_fn;
+    }
+});
+
+var iterator_fn = new Proxy(function() {}, {
+    apply() {
+        s += 'i';
+        return it;
+    }
+});
+
+var obj = new Proxy({}, {
+    get: function (receiver, name) {
+        assertEq(name, Symbol.iterator);
+        s += "I";
+        return iterator_fn;
+    }
+});
+
+for (var v of obj)
+    s += v;
+
+assertEq(s, 'IiNn0n1n2n');