Announcing Rust 1.99.0
Rust 1.99.0 stabilizes defining C-ABI variadic functions in Rust, raw-pointer layout queries for potentially dynamically sized types, and Box::into_non_null. The release also updates Box::leak guidance: don’t reconstruct and free leaked allocations; use the new ownership-transfer API instead, especially as custom allocators approach stabilization.
The Rust blog lists additional stable library APIs, including VecDeque::retain_back and array-box iteration. The linked r/rust announcement had no comments when checked.