Johnni Winther
4292d9cc28
+ use legacy erasure on weak mode const object checking + changes Null to subtype of Never when ignoring nullabilities Closes #43606 Closes #43624 Change-Id: Ief695829c550562ec1bfd0c1145cc33c584a4b8a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/165805 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
28 lines
1.1 KiB
Dart
28 lines
1.1 KiB
Dart
// Copyright (c) 2020, 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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// Test derived from language/nnbd/subtyping/function_type_bounds_weak_test
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import 'const_is_lib.dart';
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main() {
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// void fn<T extends Object>() is void Function<T extends Object?>()
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// Should pass with weak checking because when the nullability information on
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// Object and Object? are erased the type bounds are equivalent.
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expect(true, fnWithNonNullObjectBound is fnTypeWithNullableObjectBound);
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const test1 = fnWithNonNullObjectBound is fnTypeWithNullableObjectBound;
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expect(true, test1);
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// void fn<T extends Null>() is void Function<T extends Never>()
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// Should pass with weak checking because because Null becomes equivalent to
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// the bottom type.
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expect(true, fnWithNullBound is fnTypeWithNeverBound);
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const test2 = fnWithNullBound is fnTypeWithNeverBound;
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expect(true, test2);
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}
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expect(expected, actual) {
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if (expected != actual) throw "Expected $expected, actual $actual";
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}
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