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Rust 1.89 added a new warning:
warning: hiding a lifetime that's elided elsewhere is confusing
--> src/setup/repo.rs:4:14
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4 | fn setup(&mut self) -> Setup;
| ^^^^^^^^^ ----- the same lifetime is hidden here
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| the lifetime is elided here
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= help: the same lifetime is referred to in inconsistent ways, making the signature confusing
help: use `'_` for type paths
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4 | fn setup(&mut self) -> Setup<'_>;
| ++++
I don't entirely agree with the style advice here, but lifetime elision style is an evolving area in Rust and I'd rather track the Rust team's recommendations than invent my own, so I've added all of them.
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There are a couple of migration suggestions from `cargo fix --edition` that I have deliberately skipped, which are intended to make sure that the changes to `if let` scoping don't bite us. They don't, I'm pretty sure, and if I turn out to be wrong, I'd rather fix the scoping issues (as they arise) than use `match` (`cargo fix --edition`'s suggestion).
This change also includes a bulk reformat and a clippy cleanup.
NOTA BENE: As this requires a new Rust toolchain, you'll need to update Rust (`rustup update`, normally) or the server won't build. This also applies to the Debian builder Docker image; it'll need to be rebuilt (from scratch, pulling its base image again) as well.
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