[Cython] Bug: operator[] does not respect except +

[J Robert Ray]

I apologize for not having a working demonstration, but I have found this
bug and verified it is still an issue in Cython 0.20.2. No try/catch block
is generated for operator[]. In contrast, a try/catch block does get
generated for operator().

If it is any use, here is a paraphrasing of the pyx code and the generated
cpp code.

cdef extern from "blah.h" namespace "blah":
    cdef cppclass Blah:
        int operator[](int) except +

...

cdef class PyBlah:
    ...
    def demo(self, int index):
        return deref(self.thisptr)[index]

...

/* "Blah.pyx":107
 *     def demo(self, int index):
 *         return deref(self.thisptr)[index]             # <<<<<<<<<<<<<<
 */
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 =
__Pyx_PyInt_From_int(((*__pyx_v_self->thisptr)[__pyx_v_index])); if
(unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 107;
__pyx_clineno = __LINE__; goto __pyx_L1_error;}
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;


Please let me know if I'm doing anything wrong. Thanks!
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