Johnni Winther
eba2188053
With the patterns feature, switch cases without a break now implicitly break instead of falling through to the next case (which was an error anyway). We now insert a synthetic break statement in such cases. To avoid crashes, the implementation to `TypeAnalyzerisAlwaysExhaustiveType` is also provided. This function is not explicit test by this CL. Closes #50624 Change-Id: I5d467072e26d79d0469e216bd21b460237af931b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/278746 Reviewed-by: Jens Johansen <jensj@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>
71 lines
1.1 KiB
Dart
71 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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// @dart=2.19
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enum Enum { e1, e2 }
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int method1(Enum? e) {
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switch (e) {
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case Enum.e1:
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case Enum.e2:
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return 0;
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}
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}
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int method2(Enum? e) {
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switch (e) {
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case Enum.e1:
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case Enum.e2:
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return 0;
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case null:
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return 1;
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}
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}
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int method3(Enum? e) {
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switch (e) {
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case Enum.e1:
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case Enum.e2:
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return 0;
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default:
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return 1;
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}
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}
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int method4(Enum? e) {
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switch (e) {
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case Enum.e1:
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case Enum.e2:
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return 0;
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case null:
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default:
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return 1;
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}
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}
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test() {
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method1(Enum.e1);
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}
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main() {
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expect(0, method2(Enum.e1));
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expect(0, method2(Enum.e2));
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expect(1, method2(null));
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expect(0, method3(Enum.e1));
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expect(0, method3(Enum.e2));
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expect(1, method3(null));
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expect(0, method4(Enum.e1));
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expect(0, method4(Enum.e2));
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expect(1, method4(null));
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}
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expect(expected, actual) {
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if (expected != actual) {
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throw 'Expected $expected, actual $actual.';
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}
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}
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