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Finally, if you have questions regarding the Advent of Code, feel free to post them here and avoid spoilers (please use >!spoiler!< to hide any parts of solutions you post, it looks like this).
xml-rs is an option but is currently regarded as unmaintained in the rust advisories database. Possibly changing, but the wording in this post doesn't give me good hopes: https://github.com/netvl/xml-rs/issues/221
The one rust parser-generator I used is PEG
Sounds like https://ggez.rs/.
I guess the way to go here would be asking to extend the needless_return clippy lint to also check for returns whose expressions diverge. Feel free to open an issue for this.
Serde should be no_std, I have used it embedded with crates such as postcard. You can see how postcard disables default features of serde here : https://github.com/jamesmunns/postcard/blob/main/Cargo.toml