t / t4013 / diff.diff-tree_--cc_--stat_masteron commit git-merge: warn when -m provided on a fast forward (be242d5)
   1$ git diff-tree --cc --stat master
   259d314ad6f356dd08601a4cd5e530381da3e3c64
   3 dir/sub |    2 ++
   4 file0   |    3 +++
   5 2 files changed, 5 insertions(+), 0 deletions(-)
   6$