How does this macro work?

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In this Python implementation for microcontrollers, they use C-macro like follows:

MP_ROM_QSTR(MP_QSTR_mem16)

with:

#define MP_ROM_QSTR(q) MP_OBJ_NEW_QSTR(q)

and:

#define MP_OBJ_NEW_QSTR(qst) ((mp_obj_t)((((mp_uint_t)(qst)) << 2) | 2))

My issue is: MP_QSTR_mem16 seems to be never defined!

So, how does this work?

asked 25 secs ago

ARF

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How does this macro work?