[GHC] #14786: Compile-time panic with kind-level application in type famiy decl

[GHC]

#14786: Compile-time panic with kind-level application in type famiy decl
-------------------------------------+-------------------------------------
           Reporter:  lyxia          |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:  x86_64         |   Type of failure:  Compile-time
  (amd64)                            |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Minimal example:

 {{{
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE TypeInType #-}

 type family E e (a :: k) (orn :: e a) :: ()
 }}}

 Error message:

 {{{
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.2.2 for x86_64-unknown-linux):
         getRuntimeRep
   k_anW[sk:1] :: k0_aRs[tau:1]
   Call stack:
       CallStack (from HasCallStack):
         prettyCurrentCallStack, called at
 compiler/utils/Outputable.hs:1133:58 in ghc:Outputable
         callStackDoc, called at compiler/utils/Outputable.hs:1137:37 in
 ghc:Outputable
         pprPanic, called at compiler/types/Type.hs:1967:18 in ghc:Type

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14786>
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