Take the following example:
$ cat t2.pyx
cdef void read_callback():
foo = b"asdf"
bar = (c for c in foo)
$ cython t2.pyx
$ gcc -I/usr/include/python3.4m t2.c
t2.c: In function ‘__pyx_f_2t2_read_callback’:
t2.c:778:12: error: ‘None’ undeclared (first use in this function)
return None;
^
t2.c:778:12: note: each undeclared identifier is reported only once for
each function it appears in
t2.c:778:5: warning: ‘return’ with a value, in function returning void
return None;
^
Note that the error does not occur for
bar = (c for c in b"asdf")
or
bar = [c for c in b"asdf"]
~ mic_e
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