t/t4013/diff.diff-tree_-c_--abbrev_main

$ git diff-tree -c --abbrev main
59d314ad6f356dd08601a4cd5e530381da3e3c64
::100644 100644 100644 cead32e... 7289e35... 992913c... MM	dir/sub
::100644 100644 100644 b414108... f4615da... 10a8a9f... MM	file0
$