{"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
    let file_id = try_default!(from_proto::file_id(&snap, &params.text_document.uri)?);
    let _p = tracing::info_span!("handle_runnables").entered();
    let source_root = snap.analysis.source_root_id(file_id).ok();