Generic associated types to be stable in Rust 1.65

[NewsBot]

A new Rust blog post/announcement has been posted!

As of Rust 1.65, which is set to release on November 3rd, generic associated types (GATs) will be stable — over six and a half years after the original RFC was opened. This is truly a monumental achievement; however, as with a few of the other monumental features of Rust, like async or const generics, there are limitations in the initial stabilization that we plan to remove in the future.

The goal of this post is not to teach about GATs, but rather to briefly introduce them to any readers that might not know what they are and to enumerate a few of the limitations in initial stabilization that users are most likely to run into. More detailed information can be found in the RFC, in the GATs initiative repository, in the previous https://blog.rust-lang.org/2022/10/28/gats-stabilization.html