[GHC] #9693: Reloading GHCi with Template Haskell names can panic GHC

[GHC]

#9693: Reloading GHCi with Template Haskell names can panic GHC
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        Reporter:  maxs              |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Template Haskell  |              Version:  7.8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bollmann):

 upon a quick look at the code the initial error message is thrown in
 module `rename/RnEnv.hs` by function `lookupExactOcc_either`. But I'm
 unsure why this leaves `ghci` in an inconsistent state afterwards.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9693#comment:5>
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