Return an iterator over this function's arguments.
        The iterator will yield a ValueRef for each argument.

def arguments(self):
        """
        Return an iterator over this function's arguments.
        The iterator will yield a ValueRef for each argument.
        """
        if not self.is_function:
            raise ValueError('expected function value, got %s' % (self._kind,))
        it = ffi.lib.LLVMPY_FunctionArgumentsIter(self)
        parents = self._parents.copy()
        parents.update(function=self)
        return _ArgumentsIterator(it, parents)