forward_attrs_to_from_attributes.rs

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use darling::FromAttributes;

use syn::parse_quote;

#[derive(Default, darling::FromAttributes)]

#[darling(attributes(builder), forward_attrs)]

struct Params {

    default: Option<syn::Expr>,

    attrs: Vec<syn::Attribute>,

#[test]

fn forward_attrs_with_field() {

    let input: syn::DeriveInput = parse_quote! {

        #[doc = "Hello"]

        #[builder(default = 15)]

        struct Example;

};

    let parsed = Params::from_attributes(&input.attrs).unwrap();

    assert!(parsed.default.is_some());

    assert_eq!(parsed.attrs.len(), 1);