{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":")"}]}
    ) -> (Vec<Ty<'tcx>>, Ty<'tcx>) {
        _hir_ty: Option<&hir::Ty<'_>>,
        let input_tys = decl.inputs.iter().map(|a| self.lowerer().lower_ty(a)).collect();