static int parse_dest_spec (struct rcd_var * rcd, union value *v,
size_t *max_dst_width);
static int parse_src_spec (struct rcd_var * rcd, int type, size_t max_src_width);
static int parse_dest_spec (struct rcd_var * rcd, union value *v,
size_t *max_dst_width);
static int parse_src_spec (struct rcd_var * rcd, int type, size_t max_src_width);