测试环境

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$ go version
go version go1.14.3 darwin/amd64
$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.14.6
BuildVersion:	18G4032

安装Go后，打开VS Code，按照提示安装了微软官方的GO插件。但在安装go tools时，出现了下面的一大堆错误。

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go.toolsGopath setting is not set. Using GOPATH /Users/l2m2/go
Installing 17 tools at /Users/l2m2/go/bin in module mode.
  gocode
  gopkgs
  go-outline
  go-symbols
  guru
  gorename
  gotests
  gomodifytags
  impl
  fillstruct
  goplay
  godoctor
  dlv
  gocode-gomod
  godef
  goimports
  golint

Installing github.com/mdempsky/gocode FAILED
Installing github.com/uudashr/gopkgs/v2/cmd/gopkgs FAILED
Installing github.com/ramya-rao-a/go-outline FAILED
Installing github.com/acroca/go-symbols FAILED
Installing golang.org/x/tools/cmd/guru FAILED
Installing golang.org/x/tools/cmd/gorename FAILED
Installing github.com/cweill/gotests/... FAILED
Installing github.com/fatih/gomodifytags FAILED
Installing github.com/josharian/impl FAILED
Installing github.com/davidrjenni/reftools/cmd/fillstruct FAILED
Installing github.com/haya14busa/goplay/cmd/goplay FAILED
Installing github.com/godoctor/godoctor FAILED
Installing github.com/go-delve/delve/cmd/dlv FAILED
Installing github.com/stamblerre/gocode FAILED
Installing github.com/rogpeppe/godef FAILED
Installing golang.org/x/tools/cmd/goimports FAILED
Installing golang.org/x/lint/golint FAILED

17 tools failed to install.

gocode:
Error: Command failed: /usr/local/go/bin/go get -v github.com/mdempsky/gocode
go get github.com/mdempsky/gocode: module github.com/mdempsky/gocode: Get "https://proxy.golang.org/github.com/mdempsky/gocode/@v/list": dial tcp 172.217.160.113:443: i/o timeout
go get github.com/mdempsky/gocode: module github.com/mdempsky/gocode: Get "https://proxy.golang.org/github.com/mdempsky/gocode/@v/list": dial tcp 172.217.160.113:443: i/o timeout

解决方案

设置代理：

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$ go env -w GO111MODULE=on
$ go env -w GOPROXY=https://goproxy.io,direct

设置完成后重启VS Code，按照提示安装即可。

References