Robert Nystrom
c9d54c12f6
Change-Id: I3c5cfbc1bc5e41d2ef1598427067dea00f9f42b4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/425403 Reviewed-by: Lasse Nielsen <lrn@google.com> Commit-Queue: Lasse Nielsen <lrn@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com>
47 lines
1.3 KiB
Dart
47 lines
1.3 KiB
Dart
// Copyright (c) 2013, 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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//
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// Test reporting a compile-time error if case expressions are of type double,
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// prior to Dart 3.0 and patterns.
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// @dart=2.19
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import "package:expect/expect.dart";
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void main() {
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Expect.equals("IV", caesarSays(4));
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Expect.equals(null, caesarSays(2));
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Expect.equals(null, archimedesSays(3.14));
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}
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/// Before null safety, it was an error if the cases in a switch were not of
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/// the same type, regardless of the value expression's type. Now it is only an
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/// error if the cases are not a subtype of the value's type.
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caesarSays(n) {
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switch (n) {
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case 1:
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return "I";
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case 4:
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return "IV";
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case "M":
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return 1000;
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}
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return null;
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}
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archimedesSays(n) {
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switch (n) {
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case 3.14:
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// ^^^^
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// [analyzer] COMPILE_TIME_ERROR.CASE_EXPRESSION_TYPE_IMPLEMENTS_EQUALS
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// [cfe] Case expression '3.14' does not have a primitive operator '=='.
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return "Pi";
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case 2.71828:
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// ^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.CASE_EXPRESSION_TYPE_IMPLEMENTS_EQUALS
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// [cfe] Case expression '2.71828' does not have a primitive operator '=='.
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return "Huh?";
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}
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return null;
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}
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