numpy array with cython

Question

I'm trying to port some python code to cython and I'm encountering some minor problems.

Below you see a code snippet (simplified example) of the code.

cimport numpy as np
cimport cython
@cython.boundscheck(False) # turn of bounds-checking for entire function
@cython.wraparound(False)
@cython.nonecheck(False)
def Interpolation(cells, int nmbcellsx):
    cdef np.ndarray[float,ndim=1] celle
    cdef int cellnonzero
    cdef int i,l
    for i in range(nmbcellsx):
          celle = cells[i].e
          cellnonzero = cells[i].nonzero
          for l in range(cellnonzero):
               celle[l] = celle[l] * celle[l]

I don't understand why the inner-most loop does not fully translate to C code (ie the last line, celle[l] = ...), see output from cython -a feedback :

What am I missing here?

Thanks a lot.

Answer 1

I finally realized that a simple "return 0" at the very end of the function solves this problem. However, this behaviour seems quite strange to me. Is this actually a bug?