Re: [GHC] #12017: GHC panics on pattern synonym ‘kindPrimRep’

[GHC]

#12017: GHC panics on pattern synonym ‘kindPrimRep’
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        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 Simplied

 {{{#!hs
 {-# Language PatternSynonyms, GADTs #-}

 data Exp a where
   Constant :: a -> Exp a

 pattern MkBool :: Bool -> Exp Bool
 pattern MkBool bool = Constant bool

 pattern Tru :: Exp Bool
 pattern Tru = MkBool True
 }}}

 this breaks my stuff, but it's easy to work around.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12017#comment:1>
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