[GHC] #14908: Compiling using O1 works but panic using O2 or O3

[GHC]

#14908: Compiling using O1 works but panic using O2 or O3
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        Reporter:  josejuan          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 To be clear, this is the panic that results:

 {{{
 $ $(pwd)/../../../Software/ghc-8.0.2/bin/ghc Bug.hs -O2 -fforce-recomp
 [1 of 1] Compiling Main             ( Bug.hs, Bug.o )
 ghc.exe: panic! (the 'impossible' happened)
   (GHC version 8.0.2 for x86_64-unknown-mingw32):
         Simplifier ticks exhausted
   When trying UnfoldingDone $srec_s9Kw
   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
 }}}

 I can't reproduce this panic with GHC 8.2.2.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14908#comment:1>
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