def visit_Constant(self, node):
        """PEP 511: Constants are generated by optimizers"""
        nnode = self.dnode(node)
        node.first_line, node.first_col = ast_pos(nnode, self.bytes_pos_to_utf8)
        node.last_line = node.first_line
        node.last_col = node.first_col + len(repr(node.value))
        node.uid = (node.last_line, node.last_col)