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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 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)
}