| // Copyright (c) 2012, 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. |
| |
| // @dart = 2.9 |
| |
| import "package:expect/expect.dart"; |
| |
| abstract class Interface { |
| final x; |
| Interface(this.x); |
| } |
| |
| abstract class Abstract implements Interface { |
| String toString() => x.toString(); |
| } |
| |
| // This class does not implement "x" either, but it is not marked |
| // abstract. |
| class SubAbstract1 extends Abstract {} |
| // ^^^^^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER |
| // [cfe] The non-abstract class 'SubAbstract1' is missing implementations for these members: |
| |
| // This class does not implement "x", but is itself abstract, so that's OK. |
| abstract class SubAbstract2 extends Abstract { |
| get x; // Abstract. |
| } |
| |
| // This class does not implement "x" either, but it is not marked |
| // abstract. |
| class SubSubAbstract2 extends SubAbstract2 {} |
| // ^^^^^^^^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER |
| // [cfe] The non-abstract class 'SubSubAbstract2' is missing implementations for these members: |
| |
| class Concrete extends Abstract { |
| get x => 7; |
| } |
| |
| class SubConcrete extends Concrete { |
| final x; |
| SubConcrete(this.x); |
| } |
| |
| void main() { |
| new Abstract(); |
| // ^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.INSTANTIATE_ABSTRACT_CLASS |
| // [cfe] The class 'Abstract' is abstract and can't be instantiated. |
| Expect.equals('7', new Concrete().toString()); |
| Expect.equals('42', new SubConcrete(42).toString()); |
| Expect.equals('7', new SubConcrete(new Concrete()).toString()); |
| } |