Monad transformers and stacks of them are pretty standard though it's something library writers engage with more often than "users". There are more adventurous

Monad transformers and stacks of them are pretty standard though it's something library writers engage with more often than "users". There are more adventurous and specific ways being explored to handle things like "effects", but that exists mostly in SHE or Idris. mtl is still the practical way to go for now. I keep wanting an excuse to futz around with this: http://hackage.haskell.org/package/layers http://hackage.haskell.org/package/layers