human
Solve the following python programming problem given the following code:
@ staticmethod 
def register_header_type(type_) : 
    def _register_header_type(cls) : 
        ipv6._IPV6_EXT_HEADER_TYPE [type_] = cls 
        return cls 
return type_ 

    
    

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

return def _register_header_type(