{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"ImplTraitId::ReturnTypeImplTrait(def,"}]}
                        ImplTraitId::ReturnTypeImplTrait(def, idx) => {
                        // the substs for the bounds of each impl traits do not match
                            if matches!(mode, ImplTraitReplacingMode::TypeAlias) {