{"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"let"}]}
        let crate_root = match prefix_iter.peek() {
        let is_glob = matches!(use_tree.kind, ast::UseTreeKind::Glob);
            Some(seg) if !seg.ident.is_path_segment_keyword() && seg.ident.span.is_rust_2015() => {