add-macro-impl-error 0.1.0

Implementation of trait 'Error'
Documentation 
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use crate::prelude::*;
use proc_macro2::TokenStream;
use venial::Enum;
use quote::quote;

// Implementation of trait 'Error' for enumerations
pub(crate) fn impl_error_enum(data: Enum) -> Result<TokenStream> {
    let name = &data.name;

    Ok(quote! {
        impl std::error::Error for #name {
            fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
                None
            }
        }
    })
}