golang nilfunc 代码
文件路径：/src/cmd/vet/testdata/nilfunc/nilfunc.go
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package nilfunc
func F() {}
func Comparison() {
if F == nil { // ERROR "comparison of function F == nil is always false"
panic("can't happen")
}
}