| // 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 |
| } |
| } |
