{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"tcx.ensure_ok().mir_coroutine_witnesses(def_id);"}]}
                tcx.ensure_ok().mir_coroutine_witnesses(def_id);
            if tcx.is_coroutine(def_id.to_def_id()) {
                let _ = tcx.ensure_ok().check_coroutine_obligations(