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-- code examples from https://fpbyintuition.medium.com/ | |
{-# LANGUAGE ConstraintKinds #-} | |
{-# LANGUAGE FlexibleInstances #-} | |
{-# LANGUAGE FunctionalDependencies #-} | |
{-# LANGUAGE GADTs #-} | |
{-# LANGUAGE MultiParamTypeClasses #-} | |
{-# LANGUAGE PolyKinds #-} | |
{-# LANGUAGE TypeApplications #-} | |
{-# LANGUAGE TypeFamilies #-} |