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The new style still supports single line let-else, and there is a configuration parameter to make it be on one line also for longer lines.
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CodeRabbit
CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.
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Cameron Stephen for writing up the let-else RFC, as well as the dozen or so people who interacted with the proposal (which as far as I can see includes all of the style team)
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Caleb Cartwright and the rest of the style team (Josh Triplett, Michael Goulet, Jane Lusby) for finally pulling the trigger on it
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Clippy
A bunch of lints to catch common mistakes and improve your Rust code. Book: https://doc.rust-lang.org/clippy/