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SAFETY comments do not magically make unsafe Rust correct nor safe. And Miri cannot catch everything, and is magnitudes slower than regular program running.

https://github.com/rust-lang/rust/commit/71f5cfb21f3fd2f1740...

https://materialize.com/blog/rust-concurrency-bug-unbounded-...

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I think you might be misreading GP's comment. They are not claiming that SAFETY comments and MIRI guarantee correctness/safety; those are just being used as examples of the extra effort that can be and are expended on the relatively few unsafe blocks in your codebase, resulting in "your probability of success [being] vastly higher" compared to "might as well have used C".

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