PYTHON setup.py build_ext --inplace
PYTHON -c "import foo"
PYTHON -c "import a; a.test()"

######## setup.py ########

from Cython.Build import cythonize
from distutils.core import setup

setup(
  ext_modules = cythonize("*.pyx"),
)

######## foo.pxd ########

cdef int bar(int i) except *

cdef int (*var_opt)(int) except? -1
cdef int (*var_orig)(int) except *

######## foo.pyx ########

cdef int bar(int i) except *:
    if i == 10:
        raise ValueError()
    return i + 1

var_opt = bar   # by 'accident' of optimisation
var_orig = bar  # by declaration

######## a.pyx ########

cimport cython
from foo cimport bar, var_orig, var_opt

def test():
    assert bar(-2) == -1
    try:
        bar(10)
    except ValueError:
        pass
    else:
        assert False, "exception not raised in bar()"

    assert var_orig(-2) == -1
    try:
        var_orig(10)
    except ValueError:
        pass
    else:
        assert False, "exception not raised in var_orig()"

    assert var_opt(-2) == -1
    try:
        var_opt(10)
    except ValueError:
        pass
    else:
        assert False, "exception not raised in var_opt()"