[GHC] #12081: TypeInType Compile-time Panic

[GHC]

#12081: TypeInType Compile-time Panic
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        Reporter:  MichaelK          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1-rc4
      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):
       Wiki Page:                    |
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Changes (by goldfire):

 * keywords:   => TypeInType


Comment:

 GHC should never panic, so this is certainly a bug.

 However, your program is not type-correct: any type that classifies a
 runtime value must have kind `Type` (same as `*`). The type of `f` is
 given as `(a :: T n)`, which has kind `T n`, not `Type`. I'm not sure what
 your goal is here, but even without the panic, this program would be
 rejected by GHC.

 Thanks for reporting!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12081#comment:1>
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