{"ast_node_type":"variable","tokens":[{"end":50,"kind":"keyword","start":0,"text":"let"}]}
    let file = crate_id.data(db).root_file_id(db);
fn crate_supports_no_std(db: &dyn DefDatabase, crate_id: Crate) -> bool {
    let item_tree = db.file_item_tree(file.into());