Lasse R.H. Nielsen
f8086c81ae
Collects files from `package:async_helper` and `tests/language` that are generally useful, so that all test-related helpers are in `package:expect`. Moves the two libraries from `package:async_helper` into `package:expect`, and the `tests/language/static_type_helper.dart` file too. Deprecates `async_minitest.dart`, to follow `minitest.dart`, expecting the Flutter use of it to have been fixed to not break on deprecation (I believe Flutter no longer breaks builds on deprecations at all). Patch 1 is the actual change. Patch 2+4+8 is changing all existing references to the files. Patch 6 ignores deprecation in files still using `async_minitest.dart`. 3+5+7+9 are updating this text to make the numbers match. Then it's just test-expectations and small tweaks from there. Change-Id: I1b665135b5fef9b9a0c3b340ffe9daf874d0174c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/373120 Reviewed-by: Nate Bosch <nbosch@google.com> Reviewed-by: Devon Carew <devoncarew@google.com> Commit-Queue: Lasse Nielsen <lrn@google.com>
30 lines
961 B
Dart
30 lines
961 B
Dart
// Copyright (c) 2023, 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 that switch expressions are allowed to be empty, and that they have the
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/// proper static type behavior.
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///
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/// Note that the runtime behavior only matters in mixed-mode programs, since in
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/// fully sound programs an empty switch expression will be unreachable.
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import 'package:expect/static_type_helper.dart';
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// Note: no subtypes.
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sealed class A {}
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Never emptySwitchOnSealedClass(A a) =>
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(switch (a) {})..expectStaticType<Never>();
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void unreachableAfterEmptySwitch(A a, int? i) {
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if (i == null) {
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(switch (a) {});
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// Flow analysis should understand that since `switch (a) {}` has type
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// `Never`, the rest of this block is unreachable.
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}
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// Hence, `i` is promoted to non-nullable.
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i.isEven;
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}
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main() {}
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