// 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 main | |
type Box[A any] struct { | |
value A | |
} | |
func Nest[A /* ERROR instantiation cycle */ any](b Box[A], n int) interface{} { | |
if n == 0 { | |
return b | |
} | |
return Nest(Box[Box[A]]{b}, n-1) | |
} | |
func main() { | |
Nest(Box[int]{0}, 10) | |
} |