tests/language_2/this/implicit_this_test.dart

// 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.

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());
}