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// 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]]
// TODO(gri) Provide better position information here.
// See TODO in call.go, Checker.arguments.
f[int, Optional[int], Optional[string]]( /* ERROR does not satisfy Box */ )
}
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