LanguageFeatures/Constant-update-2018/CastOperator_A04_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 An expression of the form [e as T] is accepted as a potentially
 * and compile-time constant expression if [e] is potentially constant or
 * compile-time constant, respectively, and [T] is a compile-time constant type.
 * A compile-time constant type means any type that doesn't contain free type
 * variables, so the type expression always resolves to the exact same type.
 * @description Checks that an expression of the form [e as T] is not accepted
 * and causes compile time error if [T] is not a compile-time constant type.
 * @author iarkh@unipro.ru
 */

const x = null;

class A<T> {
  static const xxx = x as T?;
//                        ^
// [analyzer] unspecified
// [cfe] unspecified
}

const int i = 0;

main() {
  const x1 = x as i;
//                ^
// [analyzer] unspecified
// [cfe] unspecified

  const x2 = x as i?;
//                ^
// [analyzer] unspecified
// [cfe] unspecified
}