【问题】
2020的project，goland有gopath路径问题
参考https://stackoverflow.com/questions/68138664/golang-unexpected-directory-layout-even-with-right-directory-setup
【解决】
https://pdos.csail.mit.edu/6.824/labs/lab-mr.html
git clone git://g.csail.mit.edu/6.5840-golabs-2023 6.5840
