I use it to build multiple versions of Go from source locally. When a new release branch appears, I just `git worktree add release-branch-1.12 ../go1.12`, then

I use it to build multiple versions of Go from source locally. When a new release branch appears, I just `git worktree add release-branch-1.12 ../go1.12`, then `cd ../go1.12/src` and `GOROOT_BOOTSTRAP=../go1.11 ./make.bash`. It makes it very easy to try out betas while staying in sync with patch releases. It’s also great for keeping an old version of Go around if you have some project that requires it.