[GHC] #13956: ghc panic compiling lame-0.1.1

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Mon Jul 10 22:13:22 UTC 2017


#13956: ghc panic compiling lame-0.1.1
-------------------------------------+-------------------------------------
           Reporter:  uznx           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.1-rc3
           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:
-------------------------------------+-------------------------------------
 Compiling the package lame-0.1.1 using cabal, with profiling:

 [2 of 2] Compiling Codec.Audio.LAME ( Codec/Audio/LAME.hs,
 dist/build/Codec/Audio/LAME.p_o )
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.2.0.20170704 for x86_64-unknown-linux):
         Simplifier ticks exhausted
   When trying UnfoldingDone lvl_soT9
   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: 504681
   Call stack:
       CallStack (from HasCallStack):
         prettyCurrentCallStack, called at
 compiler/utils/Outputable.hs:1133:58 in ghc:Outputable
         callStackDoc, called at compiler/utils/Outputable.hs:1137:37 in
 ghc:Outputable
         pprPanic, called at compiler/simplCore/SimplMonad.hs:199:31 in
 ghc:SimplMonad

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 This is a regression; the package compiles fine with GHC 8.0.2

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13956>
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