Cython 3.2 - Function signature does not match previous declaration

[David Lawson]

I'm trying to update a cython based library to work with Python 3.14, and happened to start around the same time that Cython 3.2 was released.

The following code will compile and work on Cython < 3.2:

test.py:

def fun1():

    return 1

test.pxd:

cpdef long fun1() except -1

but on 3.2 I get "test.py:1:0: Function signature does not match previous declaration".

I believe the issue is the "except -1" as removing it solves the issue, I suppose we are defining the return type as long but -1 is int?

Is this likely to be intentional? The closest think I think I can spot on the changelog is https://github.com/cython/cython/pull/6908 but that seems to be referring more to exceptions in Python.

[da-woods]

That's a bug - I've just made a PR for a fix.

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