[GHC] #8114: GHC panic when building `thyme`

[GHC]

#8114: GHC panic when building `thyme`
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        Reporter:  Ptharien's Flame    |            Owner:
            Type:  bug                 |           Status:  new
        Priority:  normal              |        Milestone:
       Component:  Compiler            |          Version:  7.6.3
      Resolution:                      |         Keywords:
Operating System:  MacOS X             |     Architecture:  x86_64 (amd64)
 Type of failure:  Compile-time crash  |       Difficulty:  Unknown
       Test Case:                      |       Blocked By:
        Blocking:                      |  Related Tickets:
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Comment (by carter):

 the meat of the error message is
 {{{

 stgEqType: unequal
     ghc-prim:GHC.Prim.ByteArray#{(w) tc 3f}
     ghc-prim:GHC.Prim.MutableByteArray#{(w) tc 31p} s{tv h} [tv]
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.6.3 for x86_64-apple-darwin):
             *** Stg Lint ErrMsgs: in Stg2Stg ***
     <no location info>: Warning:
          [RHS of sat_sgA{v} [lid] :: main:Array.Array{tc rfc}]
         In a RHS constructor application, con type doesn't match arg
 types:
         Constructor type:
             ghc-prim:GHC.Prim.ByteArray#{(w) tc 3f} -> main:Array.Array{tc
 rfc}
         Arg types:
             ghc-prim:GHC.Prim.MutableByteArray#{(w) tc 31p} s{tv h} [tv]

 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8114#comment:3>
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