dart-sdk/tests/language/interface/duplicate_implements_test.dart
Robert Nystrom 507ebbf31f Migrate language_2/interface to NNBD.
Change-Id: I6fd1568fd24c0ae1ad3a6f6922cc4ece1b11d35b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/148952
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Reviewed-by: Erik Ernst <eernst@google.com>
Commit-Queue: Bob Nystrom <rnystrom@google.com>
2020-05-26 18:52:50 +00:00

25 lines
845 B
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.
// Check that duplicate types in implements/extends list are
// compile-time errors.
abstract class I {}
abstract class J {}
abstract class K<T> {}
class X implements I, J, I { } // //# 01: compile-time error
class X implements J, I, K<int>, K<int> { } // //# 02: compile-time error
abstract class Z implements I, J, J { } // //# 03: compile-time error
abstract class Z implements K<int>, K<int> { } // //# 04: compile-time error
main() {
X x = new X(); // //# 01: continued
X x = new X(); // //# 02: continued
Z z = new Z(); // //# 03: continued
Z z = new Z(); // //# 04: continued
}