[GHC] #14121: ghc master requires -XTypeInType where 8.2.1 does not

[GHC]

#14121: ghc master requires -XTypeInType where 8.2.1 does not
-------------------------------------+-------------------------------------
           Reporter:  duog           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.3
  (Type checker)                     |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  GHC rejects
  Unknown/Multiple                   |  valid program
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 This was found while building
 https://hackage.haskell.org/package/foundation with ghc head.

 The following code is reduced from Basement.Primitive.Error:
 {{{
 {-# LANGUAGE MagicHash, PolyKinds, RankNTypes #-}
 module FoundationRegression where

 import           GHC.Prim
 import           GHC.Types (RuntimeRep)

 error :: forall (r :: RuntimeRep) . forall (a :: TYPE r) . String -> a
 error s = raise# undefined
 }}}

 This compiles works with 8.2.1, but fails on master:
 {{{
 $ /opt/ghc/8.2.1/bin/ghc -c FoundationRegression.hs
 $ /opt/ghc/head/bin/ghc -c FoundationRegression.hs

 FoundationRegression.hs:7:17: error:
     Variable ‘r’ used as both a kind and a type
     Did you intend to use TypeInType?
   |
 7 | error :: forall (r :: RuntimeRep) . forall (a :: TYPE r) . String -> a
   |                 ^^^^^^^^^^^^^^^^^
 }}}

 After adding a TypeInType language pragma the program is accepted.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14121>
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