My hot take on "rewrite your compiler in Rust":
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One big reason I use Rust because it's ecosystem of tools is much nicer and easier to work with. Every time I try cabal, hoping it has improved, I get confusing constraint solver errors. HIE is broken all the time. Hope this stuff can improve sometime - it's painful!
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Rust ecosystem is better developed, but have you tried cabal + nix + ghcid (or ghcide)? It took some figuring out first time but feedback loop is really fast now 😃
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Yeah that seems cool (definitely interested in trying out NixOS myself), but it's a lot of work to teach contributors that workflow, given the lack of beginner-friendly documentation available for Nix. I want something that works out of the box, with minimal fuss.
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AFAIK, I don't think Nix solves the 'install multiple versions of the same package at once per project' issue either. Like, Nix-style builds for cabal helps isolate cabal hell to individual projects, but you still have cabal hell. Not sure what it's like using actual Nix.