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// 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.
// Tests reified types of torn-off methods with type parameters that have
// explicit variance modifiers.
// SharedOptions=--enable-experiment=variance
import "package:expect/expect.dart";
class Contravariant<in T> {
int method(T x) { return -1; }
class Invariant<inout T> {
T method(T x) { return x; }
class LegacyCovariant<T> {
int method(T x) { return -1; }
class NoSuchMethod<inout T> implements Invariant<T> {
noSuchMethod(_) => 3;
main() {
Contravariant<int> contraDiff = new Contravariant<num>();
Expect.notType<int Function(Object)>(contraDiff.method);
Expect.type<int Function(num)>(contraDiff.method);
Contravariant<num> contraSame = new Contravariant<num>();
Expect.notType<int Function(Object)>(contraSame.method);
Expect.type<int Function(num)>(contraSame.method);
Invariant<num> invSame = new Invariant<num>();
Expect.notType<num Function(Object)>(invSame.method);
Expect.type<num Function(num)>(invSame.method);
LegacyCovariant<num> legacyDiff = new LegacyCovariant<int>();
Expect.type<int Function(Object)>(legacyDiff.method);
Expect.type<int Function(num)>(legacyDiff.method);
LegacyCovariant<num> legacySame = new LegacyCovariant<num>();
Expect.type<int Function(Object)>(legacySame.method);
Expect.type<int Function(num)>(legacySame.method);
NoSuchMethod<num> nsm = new NoSuchMethod<num>();
Expect.notType<num Function(Object)>(nsm.method);
Expect.type<num Function(num)>(nsm.method);