reachable.hon commit t1020-subdirectory.sh: use the $( ... ) construct for command substitution (c9e454c)
   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