From github.com:llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
   4ecca392d222..4c9d1bdf9400  main       -> origin/main
Switched to branch 'main'
Your branch is behind 'origin/main' by 1 commit, and can be fast-forwarded.
  (use "git pull" to update your local branch)
HEAD is now at 4c9d1bdf9400 [libc++] Implement P3836R2: Make `optional<T&>` trivially copyable (#171528)