1// run
2
3// Copyright 2010 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// Test for issue 778: Map key values that are assignment
8// compatible with the map key type must be accepted according
9// to the spec: https://golang.org/doc/go_spec.html#Indexes .
10
11package main
12
13type T2 struct {
14	x int
15}
16
17func (t *T2) f() int { return t.x }
18
19func main() {
20	type B bool
21	b := B(false)
22	mb := make(map[B]int)
23	mb[false] = 42 // this should work: false is assignment compatible with B
24	mb[b] = 42
25
26	type Z int
27	z := Z(0)
28	mz := make(map[Z]int)
29	mz[0] = 42
30	mz[z] = 42
31
32	type S string
33	s := S("foo")
34	ms := make(map[S]int)
35	ms["foo"] = 42
36	ms[s] = 42
37
38	type T struct {
39		x int
40	}
41	type P *T
42	p := P(nil)
43	mp := make(map[P]int)
44	mp[nil] = 42
45	mp[p] = 42
46	mp[&T{7}] = 42
47
48	type C chan int
49	c := make(C)
50	mc := make(map[C]int)
51	mc[nil] = 42
52	mc[c] = 42
53	mc[make(C)] = 42
54
55	type I1 interface{}
56	type I2 interface {
57		f() int
58	}
59	var i0 interface{} = z
60	var i1 I1 = p
61	m0 := make(map[interface{}]int)
62	m1 := make(map[I1]int)
63	m2 := make(map[I2]int)
64	m0[i0] = 42
65	m0[i1] = 42
66	m0[z] = 42 // this should work: z is assignment-compatible with interface{}
67	m0[new(struct {
68		x int
69	})] = 42       // this should work: *struct{x int} is assignment-compatible with interface{}
70	m0[p] = 42     // this should work: p is assignment-compatible with interface{}
71	m0[false] = 42 // this should work: false is assignment-compatible with interface{}
72	m0[17] = 42    // this should work: 17 is assignment-compatible with interface{}
73	m0["foo"] = 42 // this should work: "foo" is assignment-compatible with interface{}
74
75	m1[i0] = 42
76	m1[i1] = 42
77	m1[new(struct {
78		x int
79	})] = 42       // this should work: *struct{x int} is assignment-compatible with I1
80	m1[false] = 42 // this should work: false is assignment-compatible with I1
81	m1[17] = 42    // this should work: 17 is assignment-compatible with I1
82	m1["foo"] = 42 // this should work: "foo" is assignment-compatible with I1
83
84	m2[new(T2)] = 42 // this should work: *T2 is assignment-compatible with I2
85}
86
87/*
886g -e bug286.go
89bug286.go:23: invalid map index false - need type B
90bug286.go:80: invalid map index z - need type interface { }
91bug286.go:83: invalid map index new(struct { x int }) - need type interface { }
92bug286.go:84: invalid map index p - need type interface { }
93bug286.go:85: invalid map index false - need type interface { }
94bug286.go:86: invalid map index 17 - need type interface { }
95bug286.go:87: invalid map index "foo" - need type interface { }
96bug286.go:93: invalid map index new(struct { x int }) - need type I1
97bug286.go:94: invalid map index false - need type I1
98bug286.go:95: invalid map index 17 - need type I1
99bug286.go:96: invalid map index "foo" - need type I1
100bug286.go:99: invalid map index new(T2) - need type I2
101bug286.go:100: invalid map index t2 - need type I2
102*/
103