def _at_return(self, calculator, rule, scope, block):
        """
        Implements @return
        """
        # TODO should assert this only happens within a @function
        ret = calculator.calculate(block.argument)
        raise SassReturn(ret)
def _at_return ( self , calculator , rule , scope , block ) : ret = calculator . calculate ( block . argument ) raise SassReturn ( ret )
Implements @return