gcc/testsuite/go.test/test/const4.go

   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
   9 package main
  10
  11 var b struct {
  12         a [10]int
  13 }
  14
  15 var m map[string][20]int
  16
  17 var s [][30]int
  18
  19 const (
  20         n1 = len(b.a)
  21         n2 = len(m[""])
  22         n3 = len(s[10])
  23 )
  24
  25 // Non-constants (see also const5.go).
  26 var (
  27         n4 = len(f())
  28         n5 = len(<-c)
  29         n6 = cap(g())
  30         n7 = cap(<-c1)
  31 )
  32
  33 var calledF = false
  34
  35 func f() *[40]int {
  36         calledF = true
  37         return nil
  38 }
  39
  40 var 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
  47 var calledG = false
  48
  49 func g() *[60]int {
  50         calledG = true
  51         return nil
  52 }
  53
  54 var 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
  61 func 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 }