Macro bit_struct::bit_struct_impl

macro_rules! bit_struct_impl {
    (
        $(#[doc = $struct_doc:expr])*
        #[derive(Default)]
        $struct_vis: vis struct $name: ident ($kind: ty) {
        $(
            $(#[doc = $field_doc:expr])*
            $field: ident: $actual: ty
        ),* $(,)?
        }
    ) => { ... };
    (
        $(#[doc = $struct_doc:expr])*
        $struct_vis: vis struct $name: ident ($kind: ty) {
        $(
            $(#[doc = $field_doc:expr])*
            $field: ident: $actual: ty
        ),* $(,)?
        }
    ) => { ... };
}

Helper macro