LanguageFeatures/nnbd/overriding/override_checking_A06_t131.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 If a class [C] in an opted-in library implements the same generic
/// class [I] more than once as [I0], .., [In], and at least one of the [Ii] is
/// not syntactically equal to the others, then it is an error if
/// [NNBD_TOP_MERGE(S0, ..., Sn)] is not defined where [Si] is [NORM(Ii)].
/// Otherwise, for the purposes of runtime subtyping checks, [C] is considered to
/// implement the canonical interface given by [NNBD_TOP_MERGE(S0, ..., Sn)].
///
/// @description Check that error occurs as a result of the following cases:
///   [NNBD_TOP_MERGE(Never, int)]
///   [NNBD_TOP_MERGE(Never, int?)]
///   [NNBD_TOP_MERGE(Never, Function)]
///   [NNBD_TOP_MERGE(Never, Function?)]
///
/// @author iarkh@unipro.ru


class A<T> {}
class B implements A<Never> {}

class C_int implements A<int> {}
class C_nullable_int implements A<int?> {}
class C_Function implements A<Function> {}
class C_nullable_Function implements A<Function?> {}

class D_int extends B implements C_int {}
//    ^^^^^
// [analyzer] unspecified
// [cfe] unspecified

class D_int1 extends  C_int implements B {}
//    ^^^^^
// [analyzer] unspecified
// [cfe] unspecified

class D_nullable_int extends B implements C_nullable_int {}
//    ^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

class D_nullable_int1 extends C_nullable_int implements B {}
//    ^^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

class D_Function extends B implements C_Function {}
//    ^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

class D_Function1 extends C_Function implements B {}
//    ^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

class D_nullable_Function extends B implements C_nullable_Function {}
//    ^^^^^^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

class D_nullable_Function1 extends C_nullable_Function implements B {}
//    ^^^^^^^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

void main() {}