Compare equality of enums with named fields

Given an enum where some variant(s) have named fields (struct variants, anonymous structs),

enum S {
    Named { a: i32 },

how can we match pairs of them to write a reasonable equality function (without nested matches, and when we can't rely on a #[derive(PartialEq, Eq)])?

It's easy enough for unnamed variants as here on playground, but I nor rustc see how a match like this:

match (self, other) {
            (S::Named { a }, S::Named { a }) => true,

would be right, nor how to apply @ Bindings.

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(S::Named { a: a1 }, S::Named { a: a2 }) => ...

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