Both tools merge with git merge-tree --write-tree, which needs git 2.38,
and pr_overlap's pairwise merges also pass --merge-base, which needs
git 2.40. On an older git, such as 2.34 on Ubuntu 22.04, they stopped
with git's merge-tree usage text and nothing said what was wrong. A
failing merge now reports the version it needs and the one found when
git is older; on a recent enough git the error is unchanged.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
pr_overlap.py let a failed git or gh call escape as a bare
CalledProcessError traceback that names the command but drops the
error text, so a mistyped --base such as upstream/main (refs/heads/upstream/main
does not exist) read as an unexplained crash. The script now exits with
"pr_overlap: <command> failed with exit code N: <stderr>".
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
