From github.com:llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
   8578a0a87f4f..cd9864892553  main       -> origin/main
Switched to branch 'main'
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  (use "git pull" to update your local branch)
HEAD is now at cd9864892553 [gn] use action() instead of copy() for libcxx headers (#195948)