Hello!
When I compile the following module with "ghc -W -c A.hs" I see several
unnecessary warning messages:
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.4
$ ghc -no-recomp -W -c A.hs
<no location info>: Warning: Defined but not used: `k'
<no location info>: Warning: Defined but not used: `k'
<no location info>: Warning: Defined but not used: `k'
Adding parameters to data constructors makes the warnings disappear,
example:
data T = A Int | B Char
---------------- A.hs -------------------
{-# OPTIONS -fglasgow-exts #-}
module A where
import Data.Generics
data T = A | B
deriving (Typeable, Data)
-----------------------------------------
Best regards
Tomasz
_______________________________________________
Glasgow-haskell-bugs mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
