message_at
message_at(300, &rdsym->s_def_pos);
message_at(285, &dcs->d_redeclared_symbol->s_def_pos);
message_at(261, &psym->s_def_pos, psym->s_name);
message_at(260, &psym->s_def_pos, psym->s_name);
(message_at)(int msgid, const pos_t *pos, ...)
void message_at(int, const pos_t *, ...);
wrap_check_printf_at(message_at, msgid, pos, ##args)