[GHC] #10083: ghc: panic! (the 'impossible' happened)

[GHC]

#10083: ghc: panic! (the 'impossible' happened)
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              Reporter:  hedayaty    |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.8.4
              Keywords:              |  Operating System:  MacOS X
          Architecture:  x86_64      |   Type of failure:  Compile-time
  (amd64)                            |  crash
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 I used hprotoc to generate some code for Google protocol buffers.

 The QueryValue.proto file is attached.

 You can install hprotoc tool using cabal.
 then use
 ''hprotoc QueryValue.proto''
 to generate code. Then create a minimal cabal file.
 ''cabal init -m --is-library -n''
 Then if you build it with '''optimization enabled''', the build will fail
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.8.3 for x86_64-apple-darwin):
         Simplifier ticks exhausted
     When trying UnfoldingDone $j_sEMq{v} [lid]
     To increase the limit, use -fsimpl-tick-factor=N (default 100)
     If you need to do this, let GHC HQ know, and what factor you needed
     To see detailed counts use -ddump-simpl-stats
     Total ticks: 59242

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10083>
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