1// errorcheck -0 -race
2
3//go:build (linux && amd64) || (linux && ppc64le) || (darwin && amd64) || (freebsd && amd64) || (netbsd && amd64) || (windows && amd64)
4
5// Copyright 2016 The Go Authors. All rights reserved.
6// Use of this source code is governed by a BSD-style
7// license that can be found in the LICENSE file.
8
9// Issue 17449: race instrumentation copies over previous instrumented nodes from parents block into child's Ninit block.
10// This code surfaces the duplication at compile time because of generated inline labels.
11
12package master
13
14type PriorityList struct {
15    elems []interface{}
16}
17
18func (x *PriorityList) Len() int { return len(x.elems) }
19
20func (l *PriorityList) remove(i int) interface{} {
21    elem := l.elems[i]
22    l.elems = append(l.elems[:i], l.elems[i+1:]...)
23    return elem
24}
25
26func (l *PriorityList) Next() interface{} {
27    return l.remove(l.Len() - 1)
28}
29
30var l *PriorityList
31
32func Foo() {
33    // It would fail here if instrumented code (including inline-label) was copied.
34    for elem := l.Next(); elem != nil; elem = l.Next() {
35    }
36}
37