LanguageFeatures/nnbd/static_errors_A06_t23.dart

// Copyright (c) 2020, 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 It is an error if a mixin declaration or a class declaration with
/// no generative constructors declares an instance variable without an
/// initializing expression which is final or whose type is potentially
/// non-nullable, unless the variable is marked with a `late`, `abstract`, or
/// `external` modifier.
///
/// @description Check that it is an error if a class declaration with no
/// generative constructors declares an instance variable with a potentially
/// non-nullable type and no initializing expression. Test type `FutureOr<T>`,
/// where `<T extends Object>`.
/// @author sgrekhov@unipro.ru
/// @issue 40677
/// @issue 40940

import "dart:async";

class C<T extends Object> {
  FutureOr<T> t;
//            ^
// [analyzer] unspecified
// [cfe] unspecified
  factory C.f(T t) = D;
}

class D<T extends Object> implements C<T> {
  FutureOr<T> t;
  D(this.t);
}

main() {
  print(C);
}