human
Solve the following python programming problem given the following code:
def _resolver(cls, prop) : 
    import sqlalchemy 
    from sqlalchemy.orm import foreign, remote 
    fallback = sqlalchemy.__dict__.copy () 
    fallback.update ({ 
        'foreign' : foreign, 
        'remote' : remote, 
}) 
    def resolve_arg(arg) : 
        return _class_resolver (cls, prop, fallback, arg) 
return cls 

    
    

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

return def resolve_arg(