{"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":")"}]}
    ) -> hir::FieldDef<'hir> {
        (index, f): (usize, &FieldDef),
        let ty = self.lower_ty(&f.ty, ImplTraitContext::Disallowed(ImplTraitPosition::FieldTy));