Robert Nystrom
67539c2faf
Change-Id: I318742cd4303d70c0625c9efd98bb01087aa5de4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/150466 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Erik Ernst <eernst@google.com>
38 lines
1.2 KiB
Dart
38 lines
1.2 KiB
Dart
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import "package:expect/expect.dart";
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class io_FileSystemEntity {}
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class io_Directory extends io_FileSystemEntity {}
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class _LocalDirectory
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extends _LocalFileSystemEntity<_LocalDirectory, io_Directory>
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with ForwardingDirectory, DirectoryAddOnsMixin {
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noSuchMethod(invocation) => null;
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}
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abstract class _LocalFileSystemEntity<T extends FileSystemEntity,
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D extends io_FileSystemEntity> extends ForwardingFileSystemEntity<T, D> {}
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abstract class FileSystemEntity implements io_FileSystemEntity {}
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abstract class ForwardingFileSystemEntity<T extends FileSystemEntity,
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D extends io_FileSystemEntity> implements FileSystemEntity {}
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mixin ForwardingDirectory<T extends Directory>
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on ForwardingFileSystemEntity<T, io_Directory> implements Directory {
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get t => T;
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}
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abstract class Directory implements FileSystemEntity, io_Directory {}
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abstract class DirectoryAddOnsMixin implements Directory {}
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main() {
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var x = new _LocalDirectory();
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Expect.equals(x.t, _LocalDirectory);
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}
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