diff --git a/JSTests/stress/spread-non-array.js b/JSTests/stress/spread-non-array.js
new file mode 100644
index 0000000..124789a
--- /dev/null
+++ b/JSTests/stress/spread-non-array.js
@@ -0,0 +1,62 @@
+function assert(b) {
+    if (!b)
+        throw new Error("Bad assertion.");
+}
+function foo(m) {
+    return [...m];
+}
+noInline(foo);
+
+let map = new Map;
+map.set(20, 30);
+map.set(40, 50);
+
+let called = 0;
+let customIterator = {
+    [Symbol.iterator]: function() {
+        called++;
+        let count = 0;
+        return {
+            next() {
+                called++;
+                count++;
+                if (count === 1)
+                    return {done: false, value: [20, 30]};
+                if (count === 2)
+                    return {done: false, value: [40, 50]};
+                return {done: true};
+            }
+        };
+    }
+};
+for (let i = 0; i < 10000; i++) {
+    for (let o of [customIterator, map]) {
+        let [[a, b], [c, d]] = foo(o);
+        assert(a === 20);
+        assert(b === 30);
+        assert(c === 40);
+        assert(d === 50);
+    }
+    assert(called === 4);
+    called = 0;
+}
+
+function bar(m) {
+    return [...m, ...m];
+}
+noInline(bar);
+for (let i = 0; i < 10000; i++) {
+    for (let o of [customIterator, map]) {
+        let [[a, b], [c, d], [e, f], [g, h]] = bar(o);
+        assert(a === 20);
+        assert(b === 30);
+        assert(c === 40);
+        assert(d === 50);
+        assert(e === 20);
+        assert(f === 30);
+        assert(g === 40);
+        assert(h === 50);
+    }
+    assert(called === 8);
+    called = 0;
+}