{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"GenericArg::Type(_)"}]}
                GenericArg::Type(_) => GenericArg::Type(self.mk_ty(attr_span, TyKind::Err(guar))),
            return Ok(Some(match arg {
                GenericArg::Const(_) => {