{"ast_node_type":"function","tokens":[{"end":79,"kind":"keyword","start":0,"text":"fn"}]}
    fn change_fixup_to_match_old_server(&self, tt: &mut tt::TopSubtree<Span>) {
    /// On some server versions, the fixup ast id is different than ours. So change it to match.
        const OLD_FIXUP_AST_ID: ErasedFileAstId = ErasedFileAstId::from_raw(!0 - 1);