| // run | |
| // Copyright 2026 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 | |
| //go:noinline | |
| func id[T any](x T) T { return x } | |
| //go:noinline | |
| func stale[T any](p *T, v T) T { | |
| q := id[*T](p) | |
| *q = v | |
| var zero T | |
| *p = zero | |
| return *q | |
| } | |
| var a, b = 7, 9 | |
| func main() { | |
| p := &a | |
| r := stale[*int](&p, &b) | |
| if p != nil { | |
| panic("p is not nil") | |
| } | |
| if r != nil { | |
| panic("r is not nil") | |
| } | |
| } |