haskell-mtl: haskell-mtl (Monad classes, using functional dependencies) haskell-mtl: haskell-mtl: Monad classes using functional dependencies, with instances for haskell-mtl: various monad transformers, inspired by the paper Functional haskell-mtl: Programming with Overloading and Higher-Order Polymorphism, by Mark haskell-mtl: P Jones, in Advanced School of Functional Programming, 1995. haskell-mtl: haskell-mtl: https://hackage.haskell.org/package/mtl haskell-mtl: haskell-mtl: haskell-mtl: