{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
                let _ = tcx.ensure_ok().check_coroutine_obligations(
                tcx.ensure_ok().mir_coroutine_witnesses(def_id);
                    tcx.typeck_root_def_id(def_id.to_def_id()).expect_local(),