@jaror @BoydStephenSmithJr Understandable… I’ve thought default rules made that possible.

Anyway, I didn’t encounter much problems with type classes while teaching Haskell, not even as a first language. May all of my students were okay with some suspense 😅

@jaror @BoydStephenSmithJr Type classes have been in Haskell since forever. There’s no Haskell “level” that would avoid them while being a level of Haskell instead of some vague/generic “functional programming”.
If you want to teach Haskell - you teach Haskell, with its staples like type classes and laziness.