# The Rust Release Team - Announcing Rust 1.40.0 (Highlights) ![rw-book-cover|256](https://readwise-assets.s3.amazonaws.com/static/images/article4.6bc1851654a0.png) ## Metadata **Cover**:: https://readwise-assets.s3.amazonaws.com/static/images/article4.6bc1851654a0.png **Source**:: #from/readwise **Zettel**:: #zettel/fleeting **Status**:: #x **Authors**:: [[The Rust Release Team]] **Full Title**:: Announcing Rust 1.40.0 **Category**:: #articles #readwise/articles **Category Icon**:: 📰 **Document Tags**:: #rust **URL**:: [blog.rust-lang.org](https://blog.rust-lang.org/2019/12/19/Rust-1.40.0.html) **Host**:: [[blog.rust-lang.org]] **Highlighted**:: [[2019-12-31]] **Created**:: [[2022-09-26]] ## Highlights - Option::flatten - `#[non_exhaustive]` structs, enums, and variants