blob: 36b774faaf0769264c85a96f51155e47e6b6f76f [file] [log] [blame]
// UNREVIEWED
// Copyright 2020 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 Optional[T any] struct {}
func (_ Optional[T]) Val() (T, bool)
type Box[T any] interface {
Val() (T, bool)
}
func f[V interface{}, A, B Box[V]]() {}
func _() {
f[int, Optional[int], Optional[int]]()
f[int, Optional[int], Optional /* ERROR does not satisfy Box */ [string]]()
}