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, https://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 } 83
