reachable.hon commit tree-diff: allow diff_tree_sha1 to accept NULL sha1 (7913032)
   1#ifndef REACHEABLE_H
   2#define REACHEABLE_H
   3
   4struct progress;
   5extern void mark_reachable_objects(struct rev_info *revs, int mark_reflog, struct progress *);
   6
   7#endif