Rust proc macro derive style

mod.rs

// Style A: Single attribute for the crate.

#[derive(yardi::Present, yardi::Parse, /* yardi::..., */ yardi::Rdata)]
#[yardi(rdata_class = "crate::datatypes::Class::IN", rdata_ty = "crate::datatypes::Ty::NAPTR")]
struct Naptr<'a> {
    #[doc = "Order: Low numbers are processed before higher numbers."]
    pub order: u16,
    // ...
    #[doc = "Regexp: Substitution expression to apply to the original string to construct the next domain to lookup."]
    #[yardi(
        present = "|m, e| crate::datatypes::bytes::present_charstr(m, e, 0, 255)",
        parse = "|e| crate::datatypes::bytes::parse_charstr(e, 0, 255)",
        // ... = ...
    )]
    pub regexp: std::borrow::Cow<'a, [u8]>,
    // ...
}

// Style B: Attribute per macro prefixed with crate name.

#[derive(yardi::Present, yardi::Parse, /* yardi::..., */ yardi::Rdata)]
#[yardi_rdata(class = "crate::datatypes::Class::IN", ty = "crate::datatypes::Ty::NAPTR")]
struct Naptr<'a> {
    #[doc = "Order: Low numbers are processed before higher numbers."]
    pub order: u16,
    // ...
    #[doc = "Regexp: Substitution expression to apply to the original string to construct the next domain to lookup."]
    #[yardi_present = "|m, e| crate::datatypes::bytes::present_charstr (m, e, 0, 255)"]
    #[yardi_parse = "|e| crate::datatypes::bytes::parse_charstr(e, 0, 255)"]
    // #[yardi_... = ...]
    pub regexp: std::borrow::Cow<'a, [u8]>,
    // ...
}