# Unsized Types

The first edition of the book is no longer distributed with Rust's documentation.

If you came here via a link or web search, you may want to check out [the current
version of the book](../ch20-03-advanced-types.html#dynamically-sized-types-and-the-sized-trait) instead.

If you have an internet connection, you can [find a copy distributed with
Rust
1.30](https://doc.rust-lang.org/1.30.0/book/first-edition/unsized-types.html).
