Re: [Haskell-beginners] Difference between Char and Data.Char modules

Char dates from the Haskell 98 specification, before hierarchical modules were standardised. Data.Char is the newer hierarchical module - it has been the de facto standard for a long time. Haskell 98 is still supported by GHC but it is no longer the default - I think you have to provide flags at the command line to get H98 automatically. I'm not sure if the GLR (or attribute grammar) bits of Happy are actively used, so you might expect a few infelicities if you try to use them.