Derive derives on Error not ErrorKind

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ctxerr"
-version = "0.2.0"
+version = "0.2.3"
 authors = ["Andrey Tkachenko <andrey@aidev.ru>"]
 repository = "https://github.com/andreytkachenko/ctxerr.git"
 keywords = ["error", "handling", "thiserror", "context", "backtrace"]
@@ -15,5 +15,5 @@ resolver = "2"
 members = ["derive"]
 
 [dependencies]
-ctxerr_derive = {version = "0.3.0", path = "derive"}
-thiserror = "1.0.39"
+ctxerr_derive = {version = "0.4.0", path = "derive"}
+thiserror = "1.0.40"

derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ctxerr_derive"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Andrey Tkachenko <andrey@aidev.ru>"]
 repository = "https://github.com/andreytkachenko/ctxerr.git"
 keywords = ["error", "handling", "thiserror", "context", "backtrace"]
@@ -16,4 +16,4 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1"
 quote = "1"
-syn = {version = "1", features = ["full"]}
+syn = {version = "2", features = ["full"]}

derive/src/lib.rs

@@ -11,7 +11,7 @@ pub fn ctxerr(
     _metadata: proc_macro::TokenStream,
     input: proc_macro::TokenStream,
 ) -> proc_macro::TokenStream {
-    let ast: DeriveInput = syn::parse(input).unwrap();
+    let mut ast: DeriveInput = syn::parse(input).unwrap();
     let name = ast.ident.to_string();
     if !name.ends_with("Kind") {
         panic!("Ttypename should ends with `Kind`!");
@@ -19,11 +19,26 @@ pub fn ctxerr(
 
     let name_ident = &ast.ident;
     let base_name = Ident::new(&name[0..name.len() - 4], ast.ident.span());
+    let attrs = ast
+        .attrs
+        .drain(..)
+        .filter_map(|x| match x.meta {
+            syn::Meta::List(list) => Some(list.tokens),
+            _ => None,
+        })
+        .collect::<Vec<_>>();
+
     let tokens = quote! {
+        pub use __private::*;
+
+        mod __private {
+            use super::*;
+            use ctxerr::thiserror;
+
             #[derive(Debug, ctxerr::thiserror::Error)]
             #ast
 
-        #[derive(ctxerr::thiserror::Error)]
+            #[derive(ctxerr::thiserror::Error #(, #attrs)*)]
             pub struct #base_name {
                 kind: #name_ident,
                 backtrace: Option<std::backtrace::Backtrace>,
@@ -69,6 +84,7 @@ pub fn ctxerr(
                     }
                 }
             }
+        }
 
     };