140. slice::as_array — Lock a Slice Into a Fixed-Size Array Reference

Fri, 15 May 2026 09:00:00 +0100

A function hands you &[u8] but the next step wants &[u8; 32]. The old answer was <&[u8; 32]>::try_from(slice) — a turbofish-and-trait dance for what is really just a length check. Rust 1.93 stabilises slice::as_array, the method-call version that does exactly that.

Rust-1.93 on rustbites

140. slice::as_array — Lock a Slice Into a Fixed-Size Array Reference