| // compile | |
| // Copyright 2023 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 | |
| func f() { | |
| F([]int{}, func(*int) bool { return true }) | |
| } | |
| func F[S []E, E any](a S, fn func(*E) bool) { | |
| for _, v := range a { | |
| G(a, func(e E) bool { return fn(&v) }) | |
| } | |
| } | |
| func G[E any](s []E, f func(E) bool) int { | |
| for i, v := range s { | |
| if f(v) { | |
| return i | |
| } | |
| } | |
| return -1 | |
| } |