patch applied (ghc): Fix Trac #3118: missing alternative

[Simon Peyton Jones]

Thu Apr  2 08:28:34 PDT 2009  simonpj at microsoft.com
  * Fix Trac #3118: missing alternative
  Ignore-this: 9a9866ad88eae871cb98c6795c12349b
  
  This patch fixes a rather obscure bug, whereby it's possible
  for (case C a b of <alts>) to have altenatives that do not inclue
  (C a b)!  See Note [Unreachable code] in CoreUtils.
  

    M ./compiler/basicTypes/MkId.lhs -2 +6
    M ./compiler/coreSyn/CoreUtils.lhs -11 +42
    M ./compiler/simplCore/Simplify.lhs -27 +28
    M ./compiler/specialise/SpecConstr.lhs -1 +3

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20090402152834-1287e-bb012bd4479c9c8125065701a56d654b2b0f15ed.gz