| 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 a |
| 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 { // want "comparison of function F == nil is always false" |
| 24 | panic("can't happen") |
| 25 | } |
| 26 | if t.M == nil { // want "comparison of function M == nil is always false" |
| 27 | panic("can't happen") |
| 28 | } |
| 29 | if F != nil { // want "comparison of function F != nil is always true" |
| 30 | if t.M != nil { // want "comparison of function M != nil is always true" |
| 31 | return |
| 32 | } |
| 33 | } |
| 34 | panic("can't happen") |
| 35 | } |
| 36 |