> Is the situation for Rust different than as described here: https://github.com/rust-lang/rfcs/pull/208 https://github.com/rust-lang/rfcs/pull/208 In short: y

> Is the situation for Rust different than as described here: https://github.com/rust-lang/rfcs/pull/208 https://github.com/rust-lang/rfcs/pull/208 In short: yes. The wording in that quote is imprecise: I suspect that by 'attributes', pcwalton was referring to user-definable attributes like #[serde(rename_all = "...")] and to custom derive macros like #[derive(Serializable)]. It is impossible to achieve the effects of the #[repr(C)] attribute using macros or token tree transformations.