go get支持显示进度条

go-get-progress.md

修改 $GOROOT/src/cmd/go/vcs.go，作如下修改

// vcsGit describes how to use Git.
var vcsGit = &vcsCmd{
        name: "Git",
        cmd:  "git",

        createCmd:   []string{"clone --progress {repo} {dir}", "--git-dir={dir}/.git submodule update --init --recursive"},
        downloadCmd: []string{"pull --ff-only", "submodule update --init --recursive"},

。。。
        var buf bytes.Buffer
        cmd.Stdout = &buf
        cmd.Stderr = &buf
        cmd.Stdout = os.Stdout
        cmd.Stderr = os.Stderr
        err = cmd.Run()

重新编译golang源码

/usr/local/Cellar/go/1.13.3/libexec/src/cmd/go 目录下只有下面的文件

alldocs.go go_unix_test.go init_test.go mkalldocs.sh script_test.go
go11.go go_windows_test.go internal note_test.go testdata
go_test.go help_test.go main.go proxy_test.go vendor_test.go

怎么改？
ps： go 13 ， macos