1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20

extern crate proc_macro;

use proc_macro::TokenStream;
use quote::quote;
use syn;

#[proc_macro_derive(Error)]
pub fn error_macro_derive(input: TokenStream) -> TokenStream {
    let ast = syn::parse(input).unwrap();
    impl_error_macro(&ast)
}

fn impl_error_macro(ast: &syn::DeriveInput) -> TokenStream {
    let name = &ast.ident;
    let gen = quote! {
        impl cryptraits::error::Error for #name {}
    };

    gen.into()
}