1 // Copyright 2013 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 package p
6
7 type (
8 A interface {
9 a() interface {
10 ABC1
11 }
12 }
13 B interface {
14 b() interface {
15 ABC2
16 }
17 }
18 C interface {
19 c() interface {
20 ABC3
21 }
22 }
23
24 AB interface {
25 A
26 B
27 }
28 BC interface {
29 B
30 C
31 }
32
33 ABC1 interface {
34 A
35 B
36 C
37 }
38 ABC2 interface {
39 AB
40 C
41 }
42 ABC3 interface {
43 A
44 BC
45 }
46 )
47
48 var (
49 x1 ABC1
50 x2 ABC2
51 x3 ABC3
52 )
53
54 func _() {
55 // all types have the same method set
56 x1 = x2
57 x2 = x1
58
59 x1 = x3
60 x3 = x1
61
62 x2 = x3
63 x3 = x2
64
65 // all methods return the same type again
66 x1 = x1.a()
67 x1 = x1.b()
68 x1 = x1.c()
69
70 x2 = x2.a()
71 x2 = x2.b()
72 x2 = x2.c()
73
74 x3 = x3.a()
75 x3 = x3.b()
76 x3 = x3.c()
77 }
78
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