[GHC] #15443: ghc panic when running GI.init on intero REPL

[GHC]

#15443: ghc panic when running GI.init on intero REPL
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           Reporter:  esclerofilo     |             Owner:  (none)
               Type:  bug             |            Status:  new
           Priority:  normal          |         Milestone:  8.6.1
          Component:  GHCi            |           Version:  8.4.3
           Keywords:                  |  Operating System:  Linux
       Architecture:  x86_64 (amd64)  |   Type of failure:  GHCi crash
          Test Case:                  |        Blocked By:
           Blocking:                  |   Related Tickets:
Differential Rev(s):                  |         Wiki Page:
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 I cloned the [https://github.com/haskell-gi/gi-gtk-examples] repo to learn
 to use gi-gtk, deleted all version numbers in the .cabal file to make it
 build with the latest stack resolver (lts-12.2) and then opened
 ButtonBox.hs in emacs (spacemacs) with intero, opened the intero repl
 (without actually loading the buffer into the repl*) and what happened
 follows:

 {{{
 Starting:
   stack ghci --with-ghc ghci "--docker-run-args=--interactive=true
 --tty=false" --no-build --no-load gi-gtk-examples
 GHCi, version 8.4.3: http://www.haskell.org/ghc/  :? for help
 Loaded GHCi configuration from /home/vicente/Escritorio/gi-gtk-examples
 /.stack-work/intero/intero-scriptBbJ8Bq
 λ import qualified GI.Gtk as GI (main, init)
 λ GI.init Nothing
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.4.3 for x86_64-unknown-linux):
         nameModule
   system $dShow_a8qH
   Call stack:
       CallStack (from HasCallStack):
         callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in
 ghc:Outputable
         pprPanic, called at compiler/basicTypes/Name.hs:241:3 in ghc:Name

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

 the contents of {{{/home/vicente/Escritorio/gi-gtk-examples/.stack-
 work/intero/intero-scriptBbJ8Bq}}} are:

 {{{
 :set prompt ""
 :set -fbyte-code
 :set -fdefer-type-errors
 :set -fdiagnostics-color=never
 :set prompt "\4 "
 }}}

 Note: It happens on a terminal ghci invocation too, given the same
 parameters and configuration.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15443>
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