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+// |reftest| shell-option(--enable-array-from-async) skip-if(!Array.fromAsync||!xulRuntime.shell) async -- Array.fromAsync is not enabled unconditionally, requires shell-options
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.fromasync
+description: >
+  Array.fromAsync respects array mutation
+info: |
+  Array.fromAsync
+    3.j.ii.3. Let next be ? Await(IteratorStep(iteratorRecord)).
+
+  IteratorStep
+    1. Let result be ? IteratorNext(iteratorRecord).
+
+  IteratorNext
+    1.a. Let result be ? Call(iteratorRecord.[[NextMethod]], iteratorRecord.[[Iterator]]).
+
+  %AsyncFromSyncIteratorPrototype%.next
+    6.a. Let result be Completion(IteratorNext(syncIteratorRecord)).
+
+  IteratorNext
+    1.a. Let result be ? Call(iteratorRecord.[[NextMethod]], iteratorRecord.[[Iterator]]).
+
+  Array.prototype [ @@iterator ] ( )
+  Array.prototype.values ( )
+    2. Return CreateArrayIterator(O, value).
+
+  CreateArrayIterator
+    1.b.iii. If index ≥ len, return NormalCompletion(undefined).
+includes: [asyncHelpers.js, compareArray.js]
+flags: [async]
+features: [Array.fromAsync]
+---*/
+
+asyncTest(async function () {
+  const items = [1, 2, 3];
+  const promise = Array.fromAsync(items);
+  // At this point, the first element of `items` has been read, but the iterator will take other
+  // changes into account.
+  items.pop();
+  const result = await promise;
+  assert.compareArray(result, [1, 2]);
+});