#include <sys/types.h>
#include <sys/stat.h>
#include <stdbool.h>
#include "hash.h"
extern void record_file (Hash_table *ht, char const *file,
struct stat const *stats)
__attribute__ ((nonnull (2, 3)));
extern bool seen_file (Hash_table const *ht, char const *file,
struct stat const *stats);