1 use darling::{util::parse_expr, FromDeriveInput};
2 use syn::{parse_quote, Expr};
3 
4 #[derive(FromDeriveInput)]
5 #[darling(attributes(demo))]
6 pub struct Receiver {
7     #[darling(with = parse_expr::preserve_str_literal, map = Some)]
8     example1: Option<Expr>,
9 }
10 
main()11 fn main() {
12     let input = Receiver::from_derive_input(&parse_quote! {
13         #[demo(example1 = test::path)]
14         struct Example;
15     })
16     .unwrap();
17 
18     assert_eq!(input.example1, Some(parse_quote!(test::path)));
19 }
20