1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/tests/non262/Iterator/prototype/lazy-methods-reentry-not-close-iterator.js b/js/src/tests/non262/Iterator/prototype/lazy-methods-reentry-not-close-iterator.js
new file mode 100644
index 0000000000..da1e4c8c29
--- /dev/null
+++ b/js/src/tests/non262/Iterator/prototype/lazy-methods-reentry-not-close-iterator.js
@@ -0,0 +1,43 @@
+// |reftest| skip-if(!this.hasOwnProperty('Iterator'))
+
+const methods = [
+  [iter => iter.map, x => x],
+  [iter => iter.filter, x => true],
+  [iter => iter.flatMap, x => [x]],
+];
+
+for (const method of methods) {
+  const iter = [1, 2, 3].values();
+  const iterMethod = method[0](iter);
+  let iterHelper;
+  let reentered = false;
+  iterHelper = iterMethod.call(iter, x => {
+    if (x == 2) {
+      // Reenter the currently running generator.
+      reentered = true;
+      assertThrowsInstanceOf(() => iterHelper.next(), TypeError);
+    }
+    return method[1](x);
+  });
+
+  let result = iterHelper.next();
+  assertEq(result.value, 1);
+  assertEq(result.done, false);
+
+  assertEq(reentered, false);
+  result = iterHelper.next();
+  assertEq(reentered, true);
+  assertEq(result.value, 2);
+  assertEq(result.done, false);
+
+  result = iterHelper.next();
+  assertEq(result.value, 3);
+  assertEq(result.done, false);
+
+  result = iterHelper.next();
+  assertEq(result.value, undefined);
+  assertEq(result.done, true);
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);