[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:  (none)
            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 mgsloan):

 @RyanGIScott Sure! It was interesting figuring out a good way to test
 issues that only reproduce due to reload.  The approach I've taken seems
 pretty clean to me and might be useful for other such recompilation /
 reload tests.  https://phabricator.haskell.org/D4926

 It turns out that there is indeed still some funky statefulness going on.
 Fresh load of the modified version works fine, whereas reload after
 modification yields `    Data constructor ‘X’ used as a type constructor`.
 Nice that it's not a panic, but not correct and indicates some spooky
 statefulness.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9693#comment:9>
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