mirror of
https://github.com/dart-lang/sdk
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37 lines
1.3 KiB
Dart
37 lines
1.3 KiB
Dart
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// Copyright (c) 2024, 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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final kTrue = int.parse('1') == 1;
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void main() {
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final base = kTrue ? Base<String>('a') : 1;
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final baseNullable = kTrue ? Base<String?>('a') : 1;
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final sub = kTrue ? Sub<String>('a') : 1;
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final subNullable = kTrue ? Sub<String?>('a') : 1;
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Expect.isTrue(base is Base<String>, 'is Base<String>');
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Expect.isTrue(base is Base<String?>, 'is Base<String?>');
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Expect.isTrue(baseNullable is! Base<String>, 'is! Base<String>');
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Expect.isTrue(baseNullable is Base<String?>, 'is Base<String?>');
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Expect.isTrue(sub is Sub<String>, 'is Sub<String>');
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Expect.isTrue(sub is Sub<String?>, 'is Sub<String?>');
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Expect.isTrue(subNullable is! Sub<String>, 'is! Sub<String>');
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Expect.isTrue(subNullable is Sub<String?>, 'is Sub<String?>');
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Expect.isTrue(sub is! Base<String>, 'is! Base<String>');
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Expect.isTrue(sub is Base<String?>, 'is Base<String?>');
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Expect.isTrue(subNullable is! Base<String>, 'is! Base<String>');
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Expect.isTrue(subNullable is Base<String?>, 'is Base<String?>');
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}
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class Base<T> {
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Base(this.data);
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final T data;
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}
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class Sub<T> extends Base<T?> {
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Sub(super.data);
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}
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