LanguageFeatures/nnbd/weak/future_value_type_A06_t01.dart

/*
 * Copyright (c) 2021, 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.
 */
/**
 * @assertion Let f be an asynchronous non-generator function with declared
 * return type T. Then the future value type of f is futureValueType(T). The
 * function futureValueType is defined as follows:
 *
 *  futureValueType(S?) = futureValueType(S), for all S.
 *  futureValueType(S*) = futureValueType(S), for all S.
 *  futureValueType(Future<S>) = S, for all S.
 *  futureValueType(FutureOr<S>) = S, for all S.
 *  futureValueType(void) = void.
 *  futureValueType(dynamic) = dynamic.
 *  Otherwise, for all S, futureValueType(S) = Object?.
 *
 * @description Check that for asynchronous non-generator function with declared
 * return type S* futureValueType(S*) = futureValueType(S), for all S.
 *
 * @author sgrekhov@unipro.ru
 */
// Requirements=nnbd-weak

import "legacy_lib.dart";
class C {}

Future<M>? test() async {
  M? m = new M();
  bool b = (() => true)();
  if (b) {
    m = null;
  }
  return m;
//       ^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  test();
}