Rust has The Unstable Book to cover unstable features of Rust. When using an unstable feature of Rust, you need to use a special flag or rather a special attribute: #![feature(...)].
Unstable features in Rust refer to specific capabilities (language or library) as yet unstabilized for general use. You can access these on the nightly compiler (not in stable or beta channels).
Unstable features may be experimental, incomplete or subject to change.
They are in the language as a means of balancing innovation with stability. Developers get access to new features but basically on a trial basis. While the feature is classed as unstable, Rust team can refine the design, fix edge cases or abandon features if problematic.
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