golang buildtag 代码
文件路径：/src/cmd/vet/testdata/buildtag/buildtag.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.
// This file contains tests for the buildtag checker.
// ERRORNEXT "possible malformed [+]build comment"
// +builder
// +build !ignore
package testdata
// ERRORNEXT "misplaced \+build comment"
// +build toolate
var _ = 3
var _ = `
// +build notacomment
`