reachable.hon commit dir.c: git-clean -d -X: don't delete tracked directories (5bd8e2d)
   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