{"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"wfcx.register_bound("}]}
                    wfcx.register_bound(
                enter_wf_checking_ctxt(tcx, tcx.local_parent(def_id), |wfcx| {
                        ObligationCause::new(span, def_id, ObligationCauseCode::ConstParam(ty)),