Released on October 1, 2026, Rust 1.99.0 includes support for variadic extern “C” functions, stabilized APIs, and functions to query raw pointer size and alignment.
Rust language version 1.99.0 was released on October 1, 2026, according to the LWN bulletin. Changes highlighted include support for variadic extern “C” functions, functions to obtain the size and alignment of raw pointers, and several stabilized APIs. The summary does not list all of those APIs.
To check the scope of the changes, consult the LWN article by its title and date, then compare its account with Rust’s official version documentation or release notes. If you use an AI tool to study or apply the material, do not submit private code, credentials, or personal data; use reduced, anonymized examples instead.