t / t4013 / diff.diff-tree_-c_--stat_masteron commit set_try_to_free_routine(NULL) means "do nothing special" (00b0d7f)
   1$ git diff-tree -c --stat master
   259d314ad6f356dd08601a4cd5e530381da3e3c64
   3 dir/sub |    2 ++
   4 file0   |    3 +++
   5 2 files changed, 5 insertions(+), 0 deletions(-)
   6$