1 // Copyright 2013 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package testdata 6 7 func F() {} 8 9 type T struct { 10 F func() 11 } 12 13 func (T) M() {} 14 15 var Fv = F 16 17 func Comparison() { 18 var t T 19 var fn func() 20 if fn == nil || Fv == nil || t.F == nil { 21 // no error; these func vars or fields may be nil 22 } 23 if F == nil { // ERROR "comparison of function F == nil is always false" 24 panic("can't happen") 25 } 26 if t.M == nil { // ERROR "comparison of function M == nil is always false" 27 panic("can't happen") 28 } 29 if F != nil { // ERROR "comparison of function F != nil is always true" 30 if t.M != nil { // ERROR "comparison of function M != nil is always true" 31 return 32 } 33 } 34 panic("can't happen") 35 } 36
