human
Solve the following python programming problem given the following code:
@ classmethod 
def _extracts(cls, line_type, required = False, multiple = False) : 
    def decorator(fn) : 
        extractor = Extractor (function = fn, type = line_type, required = required, multiple = multiple) 
        cls._EXTRACTORS.append (extractor) 
        return fn 
return required 

    
    

    Fix the buggy line: return required
assistant
#Here is Python code to fix the buggy line: return required
.

return def decorator(