[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
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Description changed by jbayardo:

@@ -34,0 +34,4 @@
+
+ This reproduced even with a clean ~/.stack (this includes downloading the
+ GHC binaries again), and the only necessary condition to reproduce for me
+ was having lens as a dependency.

New description:

 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

 }}}

 This reproduced even with a clean ~/.stack (this includes downloading the
 GHC binaries again), and the only necessary condition to reproduce for me
 was having lens as a dependency.

--

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13017#comment:1>
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