// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package p

func f1[T any, C chan T | <-chan T](ch C) {}

func _(ch chan int)   { f1(ch) }
func _(ch <-chan int) { f1(ch) }
func _(ch chan<- int) { f1 /* ERROR chan<- int does not implement chan int \| <-chan int */ (ch) }

func f2[T any, C chan T | chan<- T](ch C) {}

func _(ch chan int)   { f2(ch) }
func _(ch <-chan int) { f2 /* ERROR <-chan int does not implement chan int \| chan<- int */ (ch) }
func _(ch chan<- int) { f2(ch) }