{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"Some(ObligationCauseCode::ImplDerived(data))"}]}
                    Some(ObligationCauseCode::ImplDerived(data)) => {
                let (item_def_id, cause_span) = match cause.as_ref().map(|cause| cause.code()) {
                        (data.impl_or_alias_def_id, data.span)