asyputchar
asy->polledio.cons_polledio_putchar = asyputchar;
static void asyputchar(cons_polledio_arg_t, uchar_t c);
asyputchar(arg, '\r');
static void asyputchar(cons_polledio_arg_t, uchar_t c);
asyputchar(arg, '\r');
asy->polledio.cons_polledio_putchar = asyputchar;