blob: c53ba0fc75dbef47d558f3af0d8cbf0cf43175e6 [file] [log] [blame]
// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.9
// Test that an assignment inside a promotion scope defeats the promotion, even
// if it is nested inside another unrelated promotion scope.
class A {}
class B extends A {}
class C extends A {}
// An invocation of the form `checkNotB(x)` verifies that the static type of `x`
// is not `B`, since `B` is not assignable to `C`.
checkNotB(C c) {}
// An invocation of the form `alwaysTrue(x)` always returns `true` regardless of
// `x`.
bool alwaysTrue(dynamic x) => true;
noNesting([A a]) {
if (a is B) {
checkNotB(a);
a = null;
}
}
nestedInsideConditionalExpressionThen([A a, Object x]) {
if (a is B) {
checkNotB(a);
x is int ? a = null : null;
}
}
nestedInsideConditionalExpressionElse([A a, Object x]) {
if (a is B) {
checkNotB(a);
x is int ? null : a = null;
}
}
nestedInsideIfStatementThenNoElse([A a, Object x]) {
if (a is B) {
checkNotB(a);
if (x is int) {
a = null;
}
}
}
nestedInsideIfStatementThenWithElse([A a, Object x]) {
if (a is B) {
checkNotB(a);
if (x is int) {
a = null;
} else {}
}
}
nestedInsideIfStatementElse([A a, Object x]) {
if (a is B) {
checkNotB(a);
if (x is int) {
} else {
a = null;
}
}
}
nestedInsideIfElementThenNoElse([A a, Object x]) {
if (a is B) {
checkNotB(a);
[if (x is int) alwaysTrue(a = null)];
}
}
nestedInsideIfElementThenWithElse([A a, Object x]) {
if (a is B) {
checkNotB(a);
[if (x is int) alwaysTrue(a = null) else 0];
}
}
nestedInsideIfElementElse([A a, Object x]) {
if (a is B) {
checkNotB(a);
[if (x is int) 0 else alwaysTrue(a = null)];
}
}
nestedInsideRhsOfAnd([A a, Object x]) {
if (a is B) {
checkNotB(a);
x is int && alwaysTrue(a = null);
}
}
nestedInsideRhsOfOr([A a, Object x]) {
if (a is B) {
checkNotB(a);
x is int || alwaysTrue(a = null);
}
}
main() {
noNesting();
nestedInsideConditionalExpressionThen();
nestedInsideConditionalExpressionElse();
nestedInsideIfStatementThenNoElse();
nestedInsideIfStatementThenWithElse();
nestedInsideIfStatementElse();
nestedInsideIfElementThenNoElse();
nestedInsideIfElementThenWithElse();
nestedInsideIfElementElse();
nestedInsideRhsOfAnd();
nestedInsideRhsOfOr();
}