1// run
2
3// Copyright 2009 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 interfaces and methods.
8
9package main
10
11type S struct {
12	a,b	int;
13}
14
15type I1 interface {
16	f	()int;
17}
18
19type I2 interface {
20	g() int;
21	f() int;
22}
23
24func (this *S) f()int {
25	return this.a;
26}
27
28func (this *S) g()int {
29	return this.b;
30}
31
32func
33main() {
34	var i1 I1;
35	var i2 I2;
36	var g *S;
37
38	s := new(S);
39	s.a = 5;
40	s.b = 6;
41
42	// call structure
43	if s.f() != 5 { panic(11); }
44	if s.g() != 6 { panic(12); }
45
46	i1 = s;		// convert S to I1
47	i2 = i1.(I2);	// convert I1 to I2
48
49	// call interface
50	if i1.f() != 5 { panic(21); }
51	if i2.f() != 5 { panic(22); }
52	if i2.g() != 6 { panic(23); }
53
54	g = i1.(*S);		// convert I1 to S
55	if g != s { panic(31); }
56
57	g = i2.(*S);		// convert I2 to S
58	if g != s { panic(32); }
59}
60