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    Curious what the result of running profile guided optimization on rustc itself is, it isn’t something I have tried to use myself before.

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      Biggest change for us in terms of failing CI (we fail on warnings) is the warning on bare trait objects:

      https://github.com/rust-lang/rust/pull/61203/

      It’s nice that Rust will make this mandatory in the future, makes it much easier to quickly spot static/dynamic polymorphism.

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        BTW, cargo fix --edition-idioms will fix them all for you automatically.