human
Solve the following python programming problem given the following code:
@ contract 
def syntheticMemberDecorator(self, memberName, defaultValue, contract, readOnly, privateMemberName, memberDelegate) : 
    '
    :type memberName: str
    :type readOnly: bool
    :type privateMemberName: str|None
    :type memberDelegate: IMemberDelegate
' 
    def decoratorFunction(cls) : 
        syntheticMember = SyntheticMember (memberName, defaultValue, contract, readOnly, privateMemberName, memberDelegate = memberDelegate) 
        SyntheticClassController (cls).addSyntheticMember (syntheticMember) 
        return cls 
return <MASK> 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def decoratorFunction(