In file included from modmachine.h:29:0,
from modmachine.c:30:
modmachine.c:535:19: error: 'MP_QSTR_rng' undeclared here (not in a function); did you mean 'MP_QSTR_reg'?
{ MP_ROM_QSTR(MP_QSTR_rng), MP_ROM_PTR(&pyb_rng_get_obj) },
^
../../py/obj.h:92:56: note: in definition of macro 'MP_OBJ_NEW_QSTR'
#define MP_OBJ_NEW_QSTR(qst) ((mp_obj_t)((((mp_uint_t)(qst)) << 2) | 2))
^~~
modmachine.c:535:7: note: in expansion of macro 'MP_ROM_QSTR'
{ MP_ROM_QSTR(MP_QSTR_rng), MP_ROM_PTR(&pyb_rng_get_obj) },
^~~~~~~~~~~
这个是啥情况?该如何解决?这个函数是干啥用的?