LanguageFeatures/Constant-update-2018/CastOperator_A04_t03.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


class A {
  A();
}

const int i = 2;

class MyClass1<T> {
  final A a;
  const MyClass1(Object o) : a = o as T;
//                               ^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

}

class MyClass2<T> {
  final A a;
  const MyClass2(Object o) : a = o as T?;
//                               ^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

}

class MyClass3<T> {
  final A a;
  const MyClass3(Object o) : a = o as i;
//                                    ^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
}