If you want "overflow-checks" in release builds for the primitive integer types you can tell Cargo that you want this, some people do so. https://doc.rust-lang.

If you want "overflow-checks" in release builds for the primitive integer types you can tell Cargo that you want this, some people do so. https://doc.rust-lang.org/cargo/reference/profiles.html https://doc.rust-lang.org/cargo/reference/profiles.html Although Rust provides Wrapping<i32> if you want that, in practice you don't want that, wrapping unsigned integers are occasionally useful and I've written code with Wrapping<u8> and Wrapping<u32> types, but wrapping signed integers basically never come up. However it is significantly faster and it remains well defined so that's why it was chosen for release builds.