Rust 1.94.0 Released with Array Windows and Cargo Improvements
Rust 1.94.0 Is Here – Array Windows, Smarter Cargo Config, and More Stabilized APIs Rust ships a new stable release every six weeks, and 1.94.0 is no exception. It landed on March 5, 2026, and while it isn’t a “rewrite the language” kind of drop, there are a handful of genuinely useful additions that are worth knowing about. Let’s walk through everything. TL;DR array_windows gives you compile-time-sized slice windows (&[T; N]) — no more dynamic slices when you know the size upfront. Cargo’s new include key lets you split and share config files across workspaces. Cargo now parses TOML 1.1 — trailing commas in inline tables, new escape sequences, and more. LazyCell / LazyLock got new methods, math constants EULER_GAMMA and GOLDEN_RATIO were added, and f32/f64::mul_add is now const. Upgrading is a single rustup update away. How to Upgrade If you’re on rustup, this is all you need: ...