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

[GHC]

#10083: ghc: panic! (the 'impossible' happened)
-------------------------------------+-------------------------------------
        Reporter:  hedayaty          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                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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Description changed by simonpj:

Old description:

> 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

New description:

 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#comment:5>
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