1// errorcheck
2
3// Copyright 2015 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Verify that comparisons of slice/map/func values against converted nil
8// values are properly rejected.
9
10package p
11
12func bug() {
13	type S []byte
14	type M map[int]int
15	type F func()
16
17	var s S
18	var m M
19	var f F
20
21	_ = s == S(nil) // ERROR "compare.*to nil|operator \=\= not defined for .|cannot compare"
22	_ = S(nil) == s // ERROR "compare.*to nil|operator \=\= not defined for .|cannot compare"
23	switch s {
24	case S(nil): // ERROR "compare.*to nil|operator \=\= not defined for .|cannot compare"
25	}
26
27	_ = m == M(nil) // ERROR "compare.*to nil|operator \=\= not defined for .|cannot compare"
28	_ = M(nil) == m // ERROR "compare.*to nil|operator \=\= not defined for .|cannot compare"
29	switch m {
30	case M(nil): // ERROR "compare.*to nil|operator \=\= not defined for .|cannot compare"
31	}
32
33	_ = f == F(nil) // ERROR "compare.*to nil|operator \=\= not defined for .|cannot compare"
34	_ = F(nil) == f // ERROR "compare.*to nil|operator \=\= not defined for .|cannot compare"
35	switch f {
36	case F(nil): // ERROR "compare.*to nil|operator \=\= not defined for .|cannot compare"
37	}
38}
39