| // compile | |
| // Copyright 2018 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. | |
| // Make sure dead write barriers are handled correctly. | |
| package main | |
| func f(p **int) { | |
| // The trick here is to eliminate the block containing the write barrier, | |
| // but only after the write barrier branches are inserted. | |
| // This requires some delicate code. | |
| i := 0 | |
| var b []bool | |
| var s string | |
| for true { | |
| if b[i] { | |
| var a []string | |
| s = a[len(s)] | |
| i = 0 | |
| } | |
| *p = nil | |
| } | |
| } |