1 files changed, 46 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/for-of/iterclose-invalid-return.js b/js/src/jit-test/tests/for-of/iterclose-invalid-return.js
new file mode 100644
index 0000000000..bda448edc7
--- /dev/null
+++ b/js/src/jit-test/tests/for-of/iterclose-invalid-return.js
@@ -0,0 +1,46 @@
+var returnInvalid = false;
+
+const iterable = {
+  [Symbol.iterator]() {
+    return {
+      i: 0,
+      next() {
+        return { value: this.i++, done: false }
+      },
+      return() {
+        return returnInvalid ? undefined : { value: "return", done: true };
+      }
+    };
+  }
+}
+
+function closeIter(o) {
+  for (var x of o) {
+    if (x == 2) {
+      break;
+    }
+  }
+}
+
+function test() {
+  with ({}) {}
+  for (var i = 0; i < 1000; i++) {
+    returnInvalid = i % 10 == 0;
+    var caught = false;
+    try {
+      closeIter(iterable);
+    } catch {
+      caught = true;
+    }
+    assertEq(caught, returnInvalid);
+  }
+}
+
+with ({}) {}
+
+test();
+
+// Force an IC in Ion.
+closeIter([1,2,3,4,5]);
+
+test();