t / t4013 / diff.noellipses-diff-tree_--root_--abbrev_initialon commit t: use sane_unset() rather than 'unset' with broken &&-chain (ed6c994)
   1$ git diff-tree --root --abbrev initial
   2444ac553ac7612cc88969031b02b3767fb8a353a
   3:000000 040000 0000000 da7a33f A        dir
   4:000000 100644 0000000 01e79c3 A        file0
   5:000000 100644 0000000 01e79c3 A        file2
   6$