CLAUDE.md for Haskell: 13 Rules That Make AI Write Idiomatic, Type-Safe Haskell

Haskell has the largest gap between code that compiles and code that's actually idiomatic of any mainstream language. The type system is powerful enough that AI can generate Haskell that type-checks but uses head on empty lists, catches errors with error "", and avoids the very abstractions that make Haskell valuable. A CLAUDE.md at your project root tells the AI which Haskell you're writing. Here are 13 rules with the highest impact. Rule 1: GHC version and language extensions...