{"ast_node_type":"import","tokens":[{"end":89,"kind":"keyword","start":0,"text":"|"}]}
            | ObligationCauseCode::ImplDerived(box ImplDerivedCause { derived, .. }) => {
            | ObligationCauseCode::WellFormedDerived(derived)
                Some((&derived.parent_code, Some(derived.parent_trait_pred)))