1// run
2
3// Copyright 2018 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
7package main
8
9//go:noinline
10func f(p, q *struct{}) bool {
11	return *p == *q
12}
13
14type T struct {
15	x struct{}
16	y int
17}
18
19//go:noinline
20func g(p, q *T) bool {
21	return p.x == q.x
22}
23
24//go:noinline
25func h(p, q func() struct{}) bool {
26	return p() == q()
27}
28
29func fi(p, q *struct{}) bool {
30	return *p == *q
31}
32
33func gi(p, q *T) bool {
34	return p.x == q.x
35}
36
37func hi(p, q func() struct{}) bool {
38	return p() == q()
39}
40
41func main() {
42	shouldPanic(func() { f(nil, nil) })
43	shouldPanic(func() { g(nil, nil) })
44	shouldPanic(func() { h(nil, nil) })
45	shouldPanic(func() { fi(nil, nil) })
46	shouldPanic(func() { gi(nil, nil) })
47	shouldPanic(func() { hi(nil, nil) })
48	n := 0
49	inc := func() struct{} {
50		n++
51		return struct{}{}
52	}
53	h(inc, inc)
54	if n != 2 {
55		panic("inc not called")
56	}
57	hi(inc, inc)
58	if n != 4 {
59		panic("inc not called")
60	}
61}
62
63func shouldPanic(x func()) {
64	defer func() {
65		if recover() == nil {
66			panic("did not panic")
67		}
68	}()
69	x()
70}
71