[GHC] #11824: GHC error in desugarer lookup

[GHC]

#11824: GHC error in desugarer lookup
-------------------------------------+-------------------------------------
           Reporter:  darchon        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  8.0.1-rc3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 In GHC8-rc3, I'm getting:

 {{{
     GHC error in desugarer lookup in CLaSH.Core.TyCon:
       Can't find interface-file declaration for variable $tcType
         Probable cause: bug in .hi-boot file, or inconsistent .hi file
         Use -ddump-if-trace to get an idea of which file caused the error
     ghc: panic! (the 'impossible' happened)
       (GHC version 8.0.0.20160411 for x86_64-unknown-linux):
         initDs IOEnv failure

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

 To reproduce (requires stack):

 * git clone -b ghc8 https://github.com/clash-lang/clash-compiler.git
 * cd clash-compiler
 * git submodule update --init
 * stack --stack-yaml=stack-ghc8.yaml build

 The -ddump-if-trace of CLaSH.Core.TyCon can be found here:
 https://gist.github.com/christiaanb/1cd84e9941f6614321719e298cc12af0

 I'm terribly sorry that the current instructions for reproducing the bug
 are to build my project and all its dependencies. I'm having a lot of
 trouble reducing the bug to a sensible/small test case, so any hints as to
 what might be the cause of this bug would be helpful.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11824>
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