{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
        let map = SpanMap::RealSpanMap(Arc::new(RealSpanMap::absolute(
        let tt = source_file.syntax().descendants().find_map(ast::TokenTree::cast).unwrap();
            EditionedFileId::current_edition(FileId::from_raw(0)),