now                88 gc/cord/de.c   history now = 0;
now               187 gc/cord/de.c       new_file -> previous = now;
now               188 gc/cord/de.c       if (now != 0) now -> map = current_map;
now               189 gc/cord/de.c       now = new_file;
now               194 gc/cord/de.c       now = now -> previous;
now               195 gc/cord/de.c       current = now -> file_contents;
now               196 gc/cord/de.c       current_map = now -> map;
now               555 gc/cord/de.c       now -> map = current_map;
now               556 gc/cord/de.c       now -> previous = now;  /* Can't back up further: beginning of the world */