1// run
2
3// Copyright 2011 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 len constants and non-constants, http://golang.org/issue/3244.
8
9package main
10
11var b struct {
12	a [10]int
13}
14
15var m map[string][20]int
16
17var s [][30]int
18
19const (
20	n1 = len(b.a)
21	n2 = len(m[""])
22	n3 = len(s[10])
23)
24
25// Non-constants (see also const5.go).
26var (
27	n4 = len(f())
28	n5 = len(<-c)
29	n6 = cap(g())
30	n7 = cap(<-c1)
31)
32
33var calledF = false
34
35func f() *[40]int {
36	calledF = true
37	return nil
38}
39
40var c = func() chan *[50]int {
41	c := make(chan *[50]int, 2)
42	c <- nil
43	c <- new([50]int)
44	return c
45}()
46
47var calledG = false
48
49func g() *[60]int {
50	calledG = true
51	return nil
52}
53
54var c1 = func() chan *[70]int {
55	c := make(chan *[70]int, 2)
56	c <- nil
57	c <- new([70]int)
58	return c
59}()
60
61func main() {
62	if n1 != 10 || n2 != 20 || n3 != 30 || n4 != 40 || n5 != 50 || n6 != 60 || n7 != 70 {
63		println("BUG:", n1, n2, n3, n4, n5, n6, n7)
64		panic("fail")
65	}
66	if !calledF {
67		println("BUG: did not call f")
68		panic("fail")
69	}
70	if <-c == nil {
71		println("BUG: did not receive from c")
72		panic("fail")
73	}
74	if !calledG {
75		println("BUG: did not call g")
76		panic("fail")
77	}
78	if <-c1 == nil {
79		println("BUG: did not receive from c1")
80		panic("fail")
81	}
82}
83