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// 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
type C0 interface{ int }
type C1 interface{ chan int }
type C2 interface{ chan int | <-chan int }
type C3 interface{ chan int | chan float32 }
type C4 interface{ chan int | chan<- int }
type C5[T any] interface{ ~chan T | <-chan T }
func _[T any](ch T) {
<-ch // ERRORx `cannot receive from ch .* \(no core type\)`
}
func _[T C0](ch T) {
<-ch // ERROR "cannot receive from non-channel ch"
}
func _[T C1](ch T) {
<-ch
}
func _[T C2](ch T) {
<-ch
}
func _[T C3](ch T) {
<-ch // ERRORx `cannot receive from ch .* \(no core type\)`
}
func _[T C4](ch T) {
<-ch // ERROR "cannot receive from send-only channel"
}
func _[T C5[X], X any](ch T, x X) {
x = <-ch
}
// test case from issue, slightly modified
type RecvChan[T any] interface {
~chan T | ~<-chan T
}
func _[T any, C RecvChan[T]](ch C) T {
return <-ch
}
func f[T any, C interface{ chan T }](ch C) T {
return <-ch
}
func _(ch chan int) {
var x int = f(ch) // test constraint type inference for this case
_ = x
}