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