Edition 2024 prep: Escape r#gen and remove redundant ref#11922
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Three edition 2021 compatible sets of changes in preparation for the edition 2025 split out from #11724. In edition 2025, `gen` is a keyword, so we escape it as `r#gen`. `ref` and `ref mut` are not allowed anymore for `&T` and `&mut T`, so we remove them. `cargo fmt` now formats inside of macros, which the 2021 formatter doesn't undo.
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Three edition 2021 compatible sets of changes in preparation for the edition 2025 split out from #11724.
In edition 2025,
genis a keyword, so we escape it asr#gen.refandref mutare not allowed anymore for&Tand&mut T, so we remove them.cargo fmtnow formats inside of macros, which the 2021 formatter doesn't undo.