Revert "Merge branch 'clang.ALFA_BeamTransport-20230311' into 'master'" (!61529) · Merge requests · atlas / athena · GitLab

Scott Snyder requested to merge revert-96b3f77d into master Mar 14, 2023

This reverts merge request !61464 (merged)

It was for hepmc2, but no longer appropriate for hepmc3.