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Parsing is something that's very pleasant in Haskell. Other languages can use parser combinators too, of course. It's good at it though.

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C-to-Rust converter is written ... in Haskell https://github.com/jameysharp/corrode

Yup! There was already a great, ready to use C parser in Haskell, and we don't have one in Rust yet.

Great example!

Yeah, fair point. That'll be a function of the fact that Haskell has tended to prioritize the concerns and problems of writing the compiler.

Complex transformations of data structures are part of the compilation activity too, but they're more difficult to spot in the wild of applications.

I'd disagree. Most business logic is just transformation of data structures in disguise. Once you have a sufficiently rich set of data structures this becomes abundantly clear.

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