blob: 53079790bab30a575ecb8045adb0074f917950b3 [file] [log] [blame]
// Copyright (c) 2018, 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.
import "package:expect/expect.dart";
// Test various invalid super-constraints for mixin declarations.
abstract class BinaryNumInt {
num foo(num x, int y);
abstract class BinaryIntNum {
num foo(int x, num y);
abstract class GetterNumNum {
num Function(num) get foo;
abstract class GetterIntInt {
int Function(int) get foo;
abstract class UnaryInt {
num foo(int x);
abstract class UnaryNum {
num foo(num x);
abstract class UnaryString {
num foo(String x);
// The super-interfaces must be *compatible*.
// Any member declared by more than one super-interface must have at
// least one most-specific signature among the super-interfaces.
// Incompatible member kinds, one is a getter, the other a method.
mixin _ on UnaryNum, GetterNumNum {} //# 01: compile-time error
// Incompatible signature structure, unary vs binary.
mixin _ on UnaryNum, BinaryNumInt {} //# 02: compile-time error
// Incompatible method parameter type, neither is more specific.
mixin _ on UnaryNum, UnaryString {} //# 03: compile-time error
// Compatible types for each parameter, but still no most specific signature.
mixin _ on BinaryNumInt, BinaryIntNum {} //# 04: compile-time error
// Incompatible return type for getter.
mixin _ on GetterNumNum, GetterIntInt {} //# 05: compile-time error
// Mixin is valid when one signature is more specific.
mixin M1 on UnaryNum, UnaryInt {
// May call the method in a super-invocation, at the most specific type.
num bar() {
class C1 implements UnaryNum, UnaryInt {
num foo(num x) => x;
class A1 = C1 with M1;
main() {
Expect.equals(42.0, A1().bar());