LanguageFeatures/nnbd/null_aware_operator_A05_t01.dart

// Copyright (c) 2019, 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 If e translates to F then e(args) translates to:
///  PASSTHRU[F, fn[x] => x(ARGS(args))]
///
/// @description If e translates to F then e(args) translates to:
///  PASSTHRU[F, fn[x] => x(ARGS(args))]
/// @author sgrekhov@unipro.ru

// Requirements=nnbd-strong

import "../../Utils/expect.dart";

typedef String Func();
String foo() => "Lily was here";
class C {
}

main() {
  Func f1 = foo;
  Expect.equals("Lily was here", foo());
  Expect.equals("Lily was here", f1());
  Expect.isTrue(C() is C);
  Expect.runtimeIsType<C>(C());

  Func? f2 = foo;
  Expect.equals("Lily was here", f2());
}