working??

src/lib.rs

@@ -5,12 +5,15 @@ use syn::{parse_macro_input, ItemEnum, DeriveInput, Data};
 
 #[proc_macro_attribute]
 pub fn http_response(_attr: TokenStream, item: TokenStream) -> TokenStream {
+    // Clone the input for multiple parsing
     let item_for_ast = item.clone();
     let item_for_quote = item.clone();
 
+    // Parse the input into a syntax tree
     let ast: DeriveInput = parse_macro_input!(item_for_ast as DeriveInput);
     let name = &ast.ident;
 
+    // Generate impl block depending on struct or enum
     let impl_block = match &ast.data {
         Data::Struct(_) => {
             quote! {
@@ -27,26 +30,32 @@ pub fn http_response(_attr: TokenStream, item: TokenStream) -> TokenStream {
                 }
             }
         }
-
         Data::Enum(data_enum) => {
+            // For each tuple-like variant with one field, try to parse resp body as that inner type
             let variant_arms = data_enum.variants.iter().filter_map(|variant| {
                 let vname = &variant.ident;
-                match &variant.fields {
+                if let Fields::Unnamed(fields) = &variant.fields {
-                    syn::Fields::Unnamed(fields) if fields.unnamed.len() == 1 => {
+                    if fields.unnamed.len() == 1 {
                         let inner_ty = &fields.unnamed.first().unwrap().ty;
                         Some(quote! {
                             if let Ok(inner) = serde_json::from_slice::<#inner_ty>(&body) {
                                 return Ok(#name::#vname(inner));
                             }
                         })
+                    } else {
+                        None
                     }
-                    _ => None,
+                } else {
+                    None
                 }
             });
 
             quote! {
                 #[async_trait::async_trait]
-                impl Responsable for #name {
+                impl Responsable for #name
+                where
+                    Self: Sized + Send,
+                {
                     async fn receive(mut resp: actix_web::ClientResponse) -> Result<Self, Box<dyn std::error::Error>> {
                         let body = resp.body().await
                             .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))?;
@@ -61,12 +70,13 @@ pub fn http_response(_attr: TokenStream, item: TokenStream) -> TokenStream {
                 }
             }
         }
-
         _ => panic!("#[http_response] only supports structs and tuple-style enum variants"),
     };
 
+    // Parse the original item as syn::Item (struct or enum)
     let original: syn::Item = syn::parse(item_for_quote).expect("Failed to parse item as syn::Item");
 
+    // Return original plus generated impl block
     let output = quote! {
         #original
         #impl_block