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Rust has editions as well as versions. The 2024 edition has been out for a while, and brings some nice features like let-chains.
When I updated Milhouse to use the 2024 edition there were a few lifetime patterns that needed to be changed to bring us in line. For Lighthouse we can roll out the edition update one crate at a time, or in batches of crates. To avoid bitrot we probably shouldn't do the whole repo in one go.
This will probably be a backwards-incompat change as it will require us to bump the MSRV to at least 1.88.