[Cython] Possible bug when using cython -Wextra

[Stefan Behnel]

Samuele Kaplun, 07.02.2013 10:16:
> I am not sure if this is a bug or it is the intended behaviour, however, 
> consider for example this snippet:
> 
> [...]
> def test():
>     cdef int i
>     for i from 0 <= i < 10:
>         print "foo"
> [...]
> 
> If I save it into x.pyx and compile it with:
> 
> $ cython -Wextra x.pyx
> 
> I obtain the warning:
> [...]
> warning: x.pyx:2:13: Unused entry 'i'
> [...]
> 
> IMHO, this is a false positive since the i variable is indeed used as a 
> counter in the loop. I guess cython considers it unused due to the fact that 
> it does not appear on the right hand side of an assignment nor it is further 
> used as an argument in a function, isn’t it?

Yes, it actually is an unused variable in your code. There is no reference
to it, only assignments.

Stefan