Announcing Rust 1.100.0 | Rust Blog
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The Rust project released Rust 1.100.0, stabilizing the never type (`!`) after 10 years and five failed attempts, and changing `Infallible` to an alias of it. The release also ships the Allocator API, the DropGuard API, zero-sized type handling, Cargo warnings for unused dependencies, reduced cache collisions, and a minimum publish age for crates. The never type permits never-to-any coercion, letting diverging expressions like `return` type-check in `match` arms, and can now be named anywhere, including `Result<T, !>`. The stabilization required a breaking change: the never type fallback shifts from `()` to `!` in the 2015, 2018, and 2021 editions, matching edition 2024, which may affect rare cases and flag more code as unreachable. Developers can update via `rustup update stable`; watch for bug reports on the fallback change and adoption of the new allocator and drop-guard APIs.
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Rust, Rust team, Cargo