t / t4013 / diff.diff_--no-index_--raw_--abbrev=4_dir2_diron commit files-backend: use `die("BUG: ...")`, not `die("internal error: ...")` (04aea8d)
   1$ git diff --no-index --raw --abbrev=4 dir2 dir
   2:000000 100644 0000... 0000... A        dir/sub
   3$