rust-lang/rustlings is a small set of exercises for getting comfortable reading and writing Rust. You fix and run the problems yourself to pick up Rust programming, and the repository's latest release is v6.5.0. The README points to using it alongside the official Rust book.
It is a repository from the rust-lang organization, written in Rust and distributed under the MIT license. Because it tells you to work through the problems as you read the book, syntax you skim past can be checked by hand right away, which keeps a syntax-first learning path short. Each exercise is deliberately small, so you can start working directly in the middle of reading the book. Demo and setup details are available on the website, and the project was created on September 15, 2015 and has collected 64413 stars so far.
However, the given material contains no changelog for v6.5.0, so what was added and fixed in this release cannot be confirmed. There is no basis for listing newly added features or reworked exercises; only the existence of the release and the version number can be confirmed. The evaluation record also shows only a momentum score of 4.5 out of 10, with no technical, quality, or novelty scores. That score does not directly describe the learning value of the repository, and the empty score fields offer no evidence about technical completeness or quality either. Since the project stays within the narrow scope of a small set of exercises for learning syntax, its level as a learning tool cannot be judged from the score. To know what changed, the repository's release page has to be checked directly.