{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"#[instrument(skip(self),"}]}
    #[instrument(skip(self), level = "debug", ret)]
    /// obligations to extract the `T`.
    fn deduce_future_output_from_obligations(&self, body_def_id: LocalDefId) -> Option<Ty<'tcx>> {