t / t4013 / diff.diff-tree_-c_--stat_--summary_masteron commit receive-pack: don't pass non-existent refs to post-{receive,update} hooks (160b81e)
   1$ git diff-tree -c --stat --summary master
   259d314ad6f356dd08601a4cd5e530381da3e3c64
   3 dir/sub |    2 ++
   4 file0   |    3 +++
   5 2 files changed, 5 insertions(+), 0 deletions(-)
   6$