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// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.9
/// @assertion Future doWhile(FutureOr<bool> f())
/// Performs an async operation repeatedly until it returns false.
/// The function f is called repeatedly while it returns either the bool
/// value true or a Future which completes with the value true.
/// If a call to f returns false or a Future that completes to false,
/// iteration ends and the future returned by doWhile is completed.
/// @description Checks that [f] may return a Future that completes to a bool.
/// @author
import "dart:async";
import "../../../Utils/expect.dart";
const int N = 5;
main() {
int num = 0;
FutureOr<bool> f() {
return new Future.value(num < N);
(_) {
Expect.equals(N, num);