{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//"}]}
        // the stability attributes are even enabled before using their queries.
        // The query lookup can take a measurable amount of time in crates with many items. Check if
        if self.feat.staged_api() || self.tcx.sess.opts.unstable_opts.force_unstable_if_unmarked {