[Cython] Misleading error message when assigning function pointers with differing except* declarations

[Michael Enßlin]

Hi,

consider the following example:

$ cat demo.pyx
cdef void (*foo)()

cdef void bar() except*:
    pass

foo = bar



$ cython demo.pyx

Error compiling Cython file:
------------------------------------------------------------
...
cdef void (*foo)()

cdef void bar() except*:
    pass

foo = bar
        ^
------------------------------------------------------------

demo.pyx:6:9: Cannot assign type 'void (void)' to 'void (*)(void)'



this is all expected behavior, but the error message is entirely
misleading; it should be something like


demo.pyx:6:9: Function pointers have incompatible 'except *' declarations.


Note that the same error message also occurs when the pointer is
declared except*, and the function isn't.

~ mic_e

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