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Rust derives currently mark generated trait methods inline

yossarian.net 5 min read Editor score 6/10

Rust’s derived trait implementations currently include `#[inline]`, though the behavior is not guaranteed. The detail matters when derived methods are part of performance-sensitive code.

What

Rust's derive macros generate implementations of traits such as Debug, Display, and Clone.

How

Expanded derived methods currently include #[inline], though the excerpt says this behavior is implied rather than guaranteed.

Why it matters

Generated inline methods can benefit trivial implementations, but large derived methods in nested error types may be a less obvious case.

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