this post was submitted on 31 Aug 2023
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Rust
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I have seen some errors along those lines (but not exactly those) while working on the Free Monads proof of concept. Especially while trying to come up with a solution that doesn't require macros (which I didn't manage in Stable Rust, exactly due to such issues).
I have yet to see them in actual production code though, but maybe I was just lucky up to now?