This release is so big that multiple useful stabilized API aren't event mentioned in the blog post like:

- bool::toggle() https://doc.rust-lang.org/stable/std/primitive.bool.html#met...

- Box::map() https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#m...

- str::trim_prefix(), str::trim_suffix, Path::trim_prefix()