Supercharging Your Code With Five Little-Known Attributes
summary
Five concrete attributes are demonstrated and shown to work on real code: non_exhaustive forces wildcard matches so adding enum variants won’t break downstream crates; deprecated plus deny(deprecated) flags old APIs so calls to the legacy pizza_validator become compile warnings or errors; the third-party pre crate adds caller-side assurances to prevent the two_box null-pointer segfault and succeeds after reallocating on the Rust side; type_tag makes trait objects serializable across crates.
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