golang p 代码
文件路径：/test/fixedbugs/issue25984.dir/p.go
// 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.
package p
type m struct {
link *m
}
var head *m
func F(m *int) bool {
return head != nil
}