[GHC] #14580: GHC panic (TypeInType) (the 'impossible' happened)

[GHC]

#14580: GHC panic (TypeInType) (the 'impossible' happened)
-------------------------------------+-------------------------------------
           Reporter:  Iceland_jack   |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.3
           Keywords:  TypeInType     |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 {{{
 $ ghci -ignore-dot-ghci
 GHCi, version 8.3.20171208: http://www.haskell.org/ghc/  :? for help
 Prelude> import Data.Kind
 Prelude Data.Kind> :set -XPolyKinds -XDataKinds -XTypeInType
 -XTypeOperators
 Prelude Data.Kind> type Cat ob = ob -> ob -> Type
 Prelude Data.Kind> data ISO' :: Cat i -> i -> i -> Type
 Prelude Data.Kind> type ISO cat a b = ISO' cat a b -> Type
 Prelude Data.Kind> type (a <--> b) iso cat = ISO (iso :: cat a b)
 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 8.3.20171208 for x86_64-unknown-linux):
         piResultTy
   k_a1x1[tau:1]
   a_a1wU[sk:1]
   Call stack:
       CallStack (from HasCallStack):
         callStackDoc, called at compiler/utils/Outputable.hs:1144:37 in
 ghc:Outputable
         pprPanic, called at compiler/types/Type.hs:951:35 in ghc:Type

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

 Prelude Data.Kind>
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14580>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler