use proc_macro::TokenStream;use quote::quote;use syn::{parse_macro_input, DeriveInput}; pub fn derive_render(input: TokenStream) -> TokenStream {    let ast = parse_macro_input!(input as DeriveInput);    let type_name = &ast.ident;    let (impl_generics, type_generics, where_clause) = ast.generics.split_for_impl();     let gen = quote! {        impl #impl_generics gpui::Render for #type_name #type_generics        #where_clause        {            fn render(&mut self, _window: &mut gpui::Window, _cx: &mut gpui::Context<Self>) -> impl gpui::Element {                gpui::Empty            }        }    };     gen.into()}