/usr/lib/python3/dist-packages/Cython/Includes/libc/stddef.pxd is in cython3 0.25.2-1.
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1 2 3 4 5 6 7 8 9 | # 7.17 Common definitions <stddef.h>
cdef extern from "<stddef.h>":
ctypedef signed int ptrdiff_t
ctypedef unsigned int size_t
ctypedef int wchar_t
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