[GHC] #11334: GHC panic when calling typeOf on a promoted data constructor

[GHC]

#11334: GHC panic when calling typeOf on a promoted data constructor
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        Reporter:  RyanGlScott       |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  8.0.1-rc1
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1757
       Wiki Page:                    |
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Comment (by RyanGlScott):

 I'm very confused. Why would we error in the case of calling `print
 (typeOf (Proxy :: Proxy 'Comp))` whenever `-XNoPolyKinds` is enabled,
 whereas something like `print (typeOf (Proxy :: Proxy 'Proxy))` is OK? The
 latter currently yields `"Proxy (Proxy * *) 'Proxy"` when `-XNoPolyKinds`
 is on (or is this a bug?).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11334#comment:15>
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