Is there a (semi) widely used debugger for haskell?
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basically the answer is no. No functional language has a good debugger, and this is a serious oversight FP people refuse to admit (no offense but it's almost a meme that people say "just use printf" for ocaml/haskell/racket/...). The only one that works is F#'s .NET debugger.
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I hear really good things from my colleagues about Mercury's debugger – with support for declarative debugging and high performance record and replay. But then… nobody uses Mercury. 😳
Also you have to be comfortable with GDB-style tooling (as opposed to one more like Intellij or VS Code).
To be clear, 'nobody' is being overly dramatic – we still use it, along with another company I think, and some people in their spare time? But it's still vanishingly small.
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But yeah, declarative debugging is seriously cool from what I hear – a bit like git bisecting the call graph to pin-point your bug. IIRC there was a version implemented for Haskell back in the day, but it might have bitrotted?
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