mirror of
https://github.com/dart-lang/sdk
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912005267d
Change-Id: I46be49b2effec3e38a3dc44cd45cfe736f77fa78 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/182680 Commit-Queue: Sigmund Cherem <sigmund@google.com> Reviewed-by: Joshua Litt <joshualitt@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com> Reviewed-by: Stephen Adams <sra@google.com>
106 lines
2.2 KiB
Dart
106 lines
2.2 KiB
Dart
// Copyright (c) 2021, 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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// Tests where late variable or field has a predictable value. An incorrect
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// optimization might try to eliminate part of the check.
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class C1 {
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late String lastTag;
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int zero(String tag) {
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lastTag = tag;
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return 0;
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}
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int one(String tag) {
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lastTag = tag;
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return 1;
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}
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int? returnNull(String tag) {
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lastTag = tag;
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return null;
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}
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late int? i1 = zero('C1.i1');
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late int i2 = zero('C1.i2');
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late int? i3 = returnNull('C1.i3');
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late int i4 = one('C1.i4');
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}
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void test1() {
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for (int i = 0; i < 10; i++) {
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final c = C1();
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Expect.equals(0, c.i1);
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Expect.equals('C1.i1', c.lastTag);
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Expect.equals(0, c.i2);
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Expect.equals('C1.i2', c.lastTag);
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Expect.equals(null, c.i3);
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Expect.equals('C1.i3', c.lastTag);
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Expect.equals(0, c.i1);
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Expect.equals('C1.i3', c.lastTag);
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Expect.equals(0, c.i2);
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Expect.equals('C1.i3', c.lastTag);
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Expect.equals(null, c.i3);
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Expect.equals('C1.i3', c.lastTag);
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Expect.equals(1, c.i4);
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Expect.equals('C1.i4', c.lastTag);
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}
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}
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class C2 {
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late String lastTag;
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int zero(String tag) {
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lastTag = tag;
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return 0;
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}
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int one(String tag) {
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lastTag = tag;
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return 1;
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}
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int? returnNull(String tag) {
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lastTag = tag;
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return null;
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}
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late final int? i1 = zero('C2.i1');
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late final int i2 = zero('C2.i2');
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late final int? i3 = returnNull('C2.i3');
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late int i4 = one('C2.i4');
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}
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void test2() {
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final c = C2();
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Expect.equals(0, c.i1);
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Expect.equals('C2.i1', c.lastTag);
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Expect.equals(0, c.i2);
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Expect.equals('C2.i2', c.lastTag);
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Expect.equals(null, c.i3);
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Expect.equals('C2.i3', c.lastTag);
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Expect.equals(0, c.i1);
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Expect.equals('C2.i3', c.lastTag);
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Expect.equals(0, c.i2);
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Expect.equals('C2.i3', c.lastTag);
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Expect.equals(null, c.i3);
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Expect.equals('C2.i3', c.lastTag);
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Expect.equals(1, c.i4);
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Expect.equals('C2.i4', c.lastTag);
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}
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main() {
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test1();
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test2();
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}
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