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 interface assignment.
8
9package main
10
11type	Iputs	interface {
12	puts	(s string) string;
13}
14
15// ---------
16
17type	Print	struct {
18	whoami	int;
19	put	Iputs;
20}
21
22func (p *Print) dop() string {
23	r := " print " + string(p.whoami + '0')
24	return r + p.put.puts("abc");
25}
26
27// ---------
28
29type	Bio	struct {
30	whoami	int;
31	put	Iputs;
32}
33
34func (b *Bio) puts(s string) string {
35	r := " bio " + string(b.whoami + '0')
36	return r + b.put.puts(s);
37}
38
39// ---------
40
41type	File	struct {
42	whoami	int;
43	put	Iputs;
44}
45
46func (f *File) puts(s string) string {
47	return " file " + string(f.whoami + '0') + " -- " + s
48}
49
50func
51main() {
52	p := new(Print);
53	b := new(Bio);
54	f := new(File);
55
56	p.whoami = 1;
57	p.put = b;
58
59	b.whoami = 2;
60	b.put = f;
61
62	f.whoami = 3;
63
64	r := p.dop();
65	expected := " print 1 bio 2 file 3 -- abc"
66	if r != expected {
67		panic(r + " != " + expected)
68	}
69}
70