![On the left: Someone browsing through a huge book captioned "Implementing equality in other languages". On the right: A tiny book labelled with the Rust code `#[derive(PartialEq, Eq)]` captioned "Implementing Eq in Rust".](https://lemmy.blahaj.zone/pictrs/image/2742f23d-ea15-49e0-9df2-1ece86e1b0d0.webp)
OCaml has ppx_deriving. PureScript has derive instance.
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OCaml has ppx_deriving. PureScript has derive instance.