golang goversion 代码
文件路径：/src/internal/goversion/goversion.go
// Copyright 2019 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 goversion
// Version is the Go 1.x version which is currently
// in development and will eventually get released.
//
// It should be updated at the start of each development cycle to be
// the version of the next Go 1.x release. See golang.org/issue/40705.
const Version = 19