[GHC] #13233: typePrimRep panic while compiling GHC with profiling

[GHC]

#13233: typePrimRep panic while compiling GHC with profiling
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Interesting, the tidy core shows,
 {{{#!hs
 -- RHS size: {terms: 1, types: 4, coercions: 0}
 StgCmmMonad.$fHasDynFlagsFCode2
   :: CgInfoDownwards -> CgState -> (# CgInfoDownwards, CgState #)
 [GblId,
  Unf=Unf{Src=<vanilla>, TopLvl=True, Value=False, ConLike=False,
          WorkFree=False, Expandable=False, Guidance=IF_ARGS [] 0 10}]
 StgCmmMonad.$fHasDynFlagsFCode2 =
   ghc-prim-0.5.0.0:GHC.Prim.(#,#)
     @ 'ghc-prim-0.5.0.0:GHC.Types.LiftedRep
     @ 'ghc-prim-0.5.0.0:GHC.Types.LiftedRep
     @ CgInfoDownwards
     @ CgState
 }}}
 Which we would have been able to eta expand without any trouble. It must
 be something in CorePrep that is gumming up the works.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13233#comment:12>
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