blob: ec84183f969bc6fcf61c1b20a34dea288c5f1705 [file] [log] [blame]
// Copyright (c) 2019, 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
class Class {
int field;
}
extension Extension on Class {
int get property => field;
void set property(int value) {
field = value;
}
int method() => field;
testImplicitThis() {
expect(null, property);
expect(42, property ??= 42);
expect(42, property ??= 87);
}
}
main() {
Class c;
expect(null, c?.property);
expect(null, c?.method);
expect(null, c?.method());
expect(null, c?.property = 42);
expect(null, Extension(c)?.property ??= 42);
c = new Class();
expect(null, c?.property);
expect(null, c?.method());
var tearOff = c?.method;
expect(null, tearOff());
expect(42, c?.property = 42);
expect(42, tearOff());
expect(null, c?.property = null);
expect(42, c?.property = 42);
c?.property = null;
expect(null, c?.property);
expect(42, c.property ??= 42);
expect(42, c.property ??= 87);
expect(null, c?.property = null);
c.property ??= 42;
expect(42, c?.property);
c.property ??= 87;
expect(42, c?.property);
c?.property = null;
expect(null, c?.property);
expect(42, Extension(c).property ??= 42);
expect(42, Extension(c).property ??= 87);
c?.property = null;
expect(null, c?.property);
Extension(c).property ??= 42;
expect(42, c?.property);
Extension(c).property ??= 87;
expect(42, c?.property);
c?.property = null;
c.testImplicitThis();
}
expect(expected, actual) {
if (expected != actual) {
throw 'Mismatch: expected=$expected, actual=$actual';
}
}