1 // errorcheck 2 3 // Copyright 2015 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 // Verify that comparisons of slice/map/func values against converted nil 8 // values are properly rejected. 9 10 package p 11 12 func bug() { 13 type S []byte 14 type M map[int]int 15 type F func() 16 17 var s S 18 var m M 19 var f F 20 21 _ = s == S(nil) // ERROR "compare.*to nil" 22 _ = S(nil) == s // ERROR "compare.*to nil" 23 switch s { 24 case S(nil): // ERROR "compare.*to nil" 25 } 26 27 _ = m == M(nil) // ERROR "compare.*to nil" 28 _ = M(nil) == m // ERROR "compare.*to nil" 29 switch m { 30 case M(nil): // ERROR "compare.*to nil" 31 } 32 33 _ = f == F(nil) // ERROR "compare.*to nil" 34 _ = F(nil) == f // ERROR "compare.*to nil" 35 switch f { 36 case F(nil): // ERROR "compare.*to nil" 37 } 38 } 39
