[GHC] #14401: Add a test ensuring that TypeReps can be stored in compact regions

[GHC]

#14401: Add a test ensuring that TypeReps can be stored in compact regions
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.2
       Component:  Test Suite        |              Version:  8.2.1
      Resolution:                    |             Keywords:  Typeable
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Indeed.  But the tail should not wag the dog.  We only get a cyclic
 `TypeRep` in one extremely specialised situation.  If that situation
 causes major problems elsewhere, let's revisit `TypeRep`.   E.g. we could
 have a special `TypeRep` for `TYPE LiftedRep`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14401#comment:1>
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