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Assertions to ensure correct assumptions about constants, types, and more.

All checks provided by this crate are performed at compile-time. This allows for finding errors quickly and early when it comes to ensuring certain features or aspects of a codebase. These macros are especially important when exposing a public API that requires types to be the same size or implement certain traits.


This crate is available on crates.io and can be used by adding the following to your project’s Cargo.toml:

static_assertions = "1.1.0"

and this to your crate root (main.rs or lib.rs):

extern crate static_assertions;

When using Rust 2018 edition, the following shorthand can help if having #[macro_use] is undesirable.

extern crate static_assertions as sa;



Very thorough examples are provided in the docs for each individual macro. Failure case examples are also documented.


See CHANGELOG.md for an exhaustive list of what has changed from one version to another.

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