PS Pretty much all my knowledge of this subject (and the pretty printing interpreter example in particular) comes from here: http://www.haskellforall.com/2012/0

PS Pretty much all my knowledge of this subject (and the pretty printing interpreter example in particular) comes from here: http://www.haskellforall.com/2012/06/you-could-have-invented-free-monads.html http://www.haskellforall.com/2012/06/you-could-have-invented...