[GHC] #13591: "*** Exception: expectJust showModule" in ghci with hs-boot

[GHC]

#13591: "*** Exception: expectJust showModule" in ghci with hs-boot
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        Reporter:  lspitzner         |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.2.1
       Component:  GHCi              |              Version:  8.2.1-rc1
      Resolution:                    |             Keywords:  ghci hs-boot
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9450             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Note that we have a patch for this which resolves the issue as reported.
 However, I suspect that this bit of code could do with some refactoring.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13591#comment:7>
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