t / t4013 / diff.diff-tree_-c_--stat_--summary_masteron commit files-backend: use `die("BUG: ...")`, not `die("internal error: ...")` (04aea8d)
   1$ git diff-tree -c --stat --summary master
   259d314ad6f356dd08601a4cd5e530381da3e3c64
   3 dir/sub | 2 ++
   4 file0   | 3 +++
   5 2 files changed, 5 insertions(+)
   6$