t / t4013 / diff.diff-tree_-c_--stat_--summary_masteron commit t0303: immediately bail out w/o GIT_TEST_CREDENTIAL_HELPER (16e4481)
   1$ git diff-tree -c --stat --summary master
   259d314ad6f356dd08601a4cd5e530381da3e3c64
   3 dir/sub |    2 ++
   4 file0   |    3 +++
   5 2 files changed, 5 insertions(+)
   6$