Andrew's git / gitweb.git / t/t4013/diff.diff-tree_--summary_initial_mode
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t / t4013 / diff.diff-tree_--summary_initial_modeon commit trace2: NULL is not allowed for va_list (ad006fe)
   1$ git diff-tree --summary initial mode
   2 mode change 100644 => 100755 file0
   3$