Macro error_chain::error_chain_processed

macro_rules! error_chain_processed {
    (
        types {}
        $( $rest: tt )*
    ) => { ... };
    (
        types {
            $error_name:ident, $error_kind_name:ident,
            $result_ext_name:ident, $result_name:ident;
        }
        $( $rest: tt )*
    ) => { ... };
    (
        types {
            $error_name:ident, $error_kind_name:ident,
            $result_ext_name:ident;
        }

        links {
            $( $link_variant:ident ( $link_error_path:path, $link_kind_path:path )
               $( #[$meta_links:meta] )*; ) *
        }

        foreign_links {
            $( $foreign_link_variant:ident ( $foreign_link_error_path:path )
               $( #[$meta_foreign_links:meta] )*; )*
        }

        errors {
            $( $error_chunks:tt ) *
        }

    ) => { ... };
}

Prefer to use error_chain instead of this macro.