[Cython] Safer exception handling

[Robert Bradshaw]

On Tue, Sep 18, 2018, 10:12 AM Jeroen Demeyer <J.Demeyer at ugent.be> wrote:

> On 2018-09-17 15:44, Robert Bradshaw wrote:
> > One of the pain points in Cython is that one must explicitly annotate
> > non-object returning functions with except clauses. Would it be worth
> > trying to change the default here, making exception-suppressing opt-in
> > rather than opt-out?
>
> Just to clarify things: are you proposing that the default would be
> "except *"?
>

We may choose an implicit default exception value.

An alternative would be to give *warnings* for functions where
> exceptions could occur but could not be propagated. For example, this
> function is totally fine:
>
> cdef int foo(int x):
>      return x
>
> but this function would give a warning:
>
> cdef int foo(x):
>      return x   # implicit conversion Python -> int
>

Given that essentially every Python operation can raise exceptions, I don't
know how useful this warning would be. Unless we expect everyone to change
their code.

and this should probably be a compile-time error:
>
> cdef int foo(x):
>      raise NotImplementedError
>
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