wit questions

wit answers

• Parsec permutation parser with separators
• Haskell type synonym issue
• Why there isn't a Functor instance for Kleisli in Control.Arrow?
• Can someone explain to me why the app function of ArrowApply makes them as powerful as monads?
• Enforced pattern order
• Haskell/Trifecta: Parsing completely optional semicolons without polluting AST