Andrew's git / gitweb.git / t/t4013/diff.diff-tree_-r_--abbrev=4_initial
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t / t4013 / diff.diff-tree_-r_--abbrev=4_initialon commit in_merge_bases(): support only one "other" commit (a20efee)
   1$ git diff-tree -r --abbrev=4 initial
   2$