Announcing Rust 1.99.0
By BIOS Founding Team
Rust 1.99.0 stabilizes defining C-ABI variadic functions with a VaList type and a VaArgSafe trait. It also stabilizes Layout::for_value_raw, mem::size_of_val_raw and mem::align_of_val_raw for raw-pointer size and alignment.
New stable APIs include Vec::into_parts and from_parts, VecDeque::retain_back, Box::into_non_null and from_non_null, String::from_utf8_lossy_owned and fs::set_times.
Full details: https://blog.rust-lang.org/2026/10/01/Rust-1.99.0/
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