{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
        let crate_id = match snap.analysis.crates_for(file_id)?.first() {
        let file_id = try_default!(from_proto::file_id(&snap, &params.text_document.uri)?);
            Some(&crate_id) => crate_id,