• Herbert Valerio Riedel's avatar
    Re-export Word from Prelude (re #9531) · 393b8202
    Herbert Valerio Riedel authored
    The original proposal text can be found at
    
      http://www.haskell.org/pipermail/libraries/2014-August/023491.html
    
    The proposal passed with a clear majority, and was additionally
    confirmed by the core libraries committee.
    
    *Compatibility Note*
    
    Only code that imports `Data.Word` for the sole purpose of using `Word`
    *and* requires to be `-Werror`-clean (due to `-fwarn-unused-imports`)
    is affected by this change.
    
    In order to write warning-free forward/backward compatible against `base`,
    a variant of the following CPP-based snippet can be used:
    
      -- Starting with base>4.7.0 or GHC>7.8 Prelude re-exports 'Word'
      -- The following is needed, if 'Word' is the *only* entity needed from Data.Word
      #ifdef MIN_VERSION_base
      # if !MIN_VERSION_base(4,7,1)
      import Data.Word (Word)
      # endif
      -- no cabal_macros.h -- fallback to __GLASGOW_HASKELL__
      #elif __GLASGOW_HASKELL__ < 709
      import Data.Word (Word)
      #endif
    
    This also updates the haddock submodule in order to avoid a compile warning
    393b8202
MkCore.lhs 31.2 KB