use syn::parse_quote;

    // Get the generics for the derived item
    let (impl_generics, type_generics, where_clause) = derive_input.generics.split_for_impl();
    // Combine all of the derived item's generic parameters along with `std::io::Write` for `Localize`
    // e.g. for MyStruct<'a, T>, it will be <'a, T, W: std::io::Write>
    let localize_impl_generics =
        derive_input
            .generics
            .params
            .clone()
            .into_iter()
            .chain(std::iter::once(syn::GenericParam::Type(
                parse_quote!(W: std::io::Write),
            )));

        impl #ident {

        impl #impl_generics #ident #type_generics #where_clause {

        impl<W: ::std::io::Write> ::fluent_embed::Localize<W> for #ident {

        impl <#(#localize_impl_generics),*> ::fluent_embed::Localize<W> for #ident #type_generics #where_clause {

                #original_item

                #derive_input