Version 1.99.1 (2026-10-15)
===========================

<a id="1.99.1"></a>

- [Enable `static_position_independent_executables` on all gnu targets]( )
- In Cargo, incremental compilation is now disabled by default when running in
  CI. CI is detected via the `CI` environment variable. [#17220]( )
- [The Rust Reference no longer recommends using a single pattern to match a
  union alongside another value, such as in a manually-written tagged union]( ).
  This was because it was found that such code would, in some circumstances,
  result in the compiler reading the contents of the union before checking if
  the rest of the scrutinee matches the rest of the pattern. This can cause
  undefined behavior in code similar to what the reference previously
  recommended.
- [Add support for unbounded left/right shift operations]( )
- [`<[[T; N]]>::as_flattened_mut`](https://doc.rust-
  lang.org/stable/std/primitive.slice.html#method.as_flattened_mut)