Re: [Haskell-beginners] Ambogous error in returning value

Hello, David! Hmm, yes, I got it. Interesting is that I tried to set explicitly types as `[a]` of `allows opts` and `denies opts` in the class too (like in instance) but without this extension: {-# LANGUAGE ScopedTypeVariables #-} and Intero nothing helps about "...do you want to include blah-blah, press C-c C-r..." as usual it does it :) OK, your explanation is absolutely enought. Thank you! Have a nice day, === Best regards, Paul