use proc_macro::TokenStream;
use syn::parse_macro_input;
#[proc_macro_derive(CompatibleWith)]
pub fn derive(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as syn::DeriveInput);
let name = input.ident;
let crate_name = syn::Ident::new("compatible_with", proc_macro2::Span::call_site());
quote::quote! {
impl<Old> From<#crate_name::Compatible<Old, #name>> for #name
where
Self: #crate_name::CompatibleWith<Old>,
{
fn from(value: #crate_name::Compatible<Old, #name>) -> Self {
value.into_current()
}
}
}
.into()
}