[GHC] #13017: GHC panics during build of etkmett/free

[GHC]

#13017: GHC panics during build of etkmett/free
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           Reporter:  jbayardo       |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 While using stack, I get the following error:


 {{{
 --  While building package free-4.12.4 using:
       /home/user/.stack/setup-exe-cache/x86_64-linux/Cabal-
 simple_mPHDZzAJ_1.24.0.0_ghc-8.0.1 --builddir=.stack-
 work/dist/x86_64-linux/Cabal-1.24.0.0 build --ghc-options " -ddump-hi
 -ddump-to-file"
     Process exited with code: ExitFailure 1
     Logs have been written to: /home/user/dev/haskellito/.stack-
 work/logs/free-4.12.4.log

     Configuring free-4.12.4...
     Building free-4.12.4...
     Preprocessing library free-4.12.4...
     [ 1 of 16] Compiling Control.Monad.Free.TH (
 src/Control/Monad/Free/TH.hs, .stack-
 work/dist/x86_64-linux/Cabal-1.24.0.0/build/Control/Monad/Free/TH.o )
     [ 2 of 16] Compiling Control.Monad.Free.Class (
 src/Control/Monad/Free/Class.hs, .stack-
 work/dist/x86_64-linux/Cabal-1.24.0.0/build/Control/Monad/Free/Class.o )
     [ 3 of 16] Compiling Control.Monad.Trans.Iter (
 src/Control/Monad/Trans/Iter.hs, .stack-
 work/dist/x86_64-linux/Cabal-1.24.0.0/build/Control/Monad/Trans/Iter.o )
     ghc: panic! (the 'impossible' happened)
       (GHC version 8.0.1 for x86_64-unknown-linux):
         Ix{Int}.index: Index (16777216) out of range ((0,392))

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

 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13017>
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