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

Ken Overton koverton at lab49.com
Thu Jun 14 21:05:58 CEST 2012

I just started looking at the Happy packag; I get a compile error when attempting to build examples/glr/expr-eval:

    Could not find module `Char'
    It is a member of the hidden package `haskell98-'.

ExprData.hs:9 says  “import Char” and if I change this to “import Data.Char” it compiles correctly (then I get a similar message for System, but when I understand Char I expect I will understand this too).

Could someone kindly explain the difference between these two modules? From the look of the error, I’m guessing there’s a history lesson involved?




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