{"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
        let inputs_span = inputs_lo.to(self.prev_token.span);
            self.parse_fn_params(|_| false)?.into_iter().map(|input| input.ty).collect();
        let output = self.parse_ret_ty(AllowPlus::No, RecoverQPath::No, RecoverReturnSign::No)?;