You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: issue25516.go
    path of file: ./repos/gccrs/gcc/testsuite/go.test/test/fixedbugs
    
    the code of the file until where you have to start completion: // 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 bar
    
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
	}
}