Callback can't have void return type

Issue #7 resolved
created an issue

"void foo(...)" callback functions work in the ctypes backend but crash the interpreter in the default backend.




from cffi import FFI, backend_ctypes

ffi = FFI()

ffi = FFI(backend=backend_ctypes.CTypesBackend())

def foo(): pass foo_cb = ffi.callback("void foo()", foo) result = foo_cb() # crash! assert result is None }}} Output: {{{ convert_from_object: 'void' Fatal Python error: convert_from_object Aborted }}}

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