expression    :   expression IN lexp

def p_expression_inlist(self, p):
        ''' expression    :   expression IN lexp 
        '''
        _LOGGER.debug("expresion -> expresion IN lexp")

        if self._autodefine_vars:
            self._init_vars(TypedList([]), p[3])

        if p[3].type != TypedClass.LIST: raise TypeError("expected list for IN operator")
        
        retval = False
        for v in p[3].value:
            if p[1] == v:
                retval = True
                break
        
        p[0] = TypedClass(retval, TypedClass.BOOLEAN)