CORD_pos_advance  173 gc/cord/cordxtra.c             CORD_pos_advance(xpos, avail);
CORD_pos_advance  174 gc/cord/cordxtra.c             CORD_pos_advance(ypos, avail);
CORD_pos_advance  217 gc/cord/cordxtra.c             CORD_pos_advance(xpos, (size_t)avail);
CORD_pos_advance  218 gc/cord/cordxtra.c             CORD_pos_advance(ypos, (size_t)avail);