human
Solve the following python programming problem given the following code:
def __call__(self, function = None, firstresult = False, historic = False) : 
    " if passed a function, directly sets attributes on the function
        which will make it discoverable to add_hookspecs().  If passed no
        function, returns a decorator which can be applied to a function
        later using the attributes supplied.

        If firstresult is True the 1:N hook call (N being the number of registered
        hook implementation functions) will stop at I<=N when the I'th function
        returns a non-None result.

        If historic is True calls to a hook will be memorized and replayed
        on later registered plugins.

        " 
    def setattr_hookspec_opts(func) : 
        if (historic and firstresult) : 
            raise ValueError ('cannot have a historic firstresult hook') 
setattr (func, (self.project_name + '_spec'), dict (firstresult = firstresult, historic = historic)) 
        return func 
if (function is not None) : 
        return setattr_hookspec_opts (function) 
else : 
        return firstresult 

    
    

    Fix the buggy line: return firstresult
assistant
#Here is Python program to fix the buggy line: return firstresult
.

return setattr_hookspec_opts