{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"const"}]}
        const OLD_FIXUP_AST_ID: ErasedFileAstId = ErasedFileAstId::from_raw(!0 - 1);
    fn change_fixup_to_match_old_server(&self, tt: &mut tt::TopSubtree<Span>) {
        let change_ast_id = |ast_id: &mut ErasedFileAstId| {