[GHC] #11362: T6137 doesn't pass with reversed uniques

[GHC]

#11362: T6137 doesn't pass with reversed uniques
-------------------------------------+-------------------------------------
        Reporter:  niteria           |                Owner:  niteria
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:  4012
 Related Tickets:  #11371            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by niteria):

 * owner:  goldfire => niteria
 * blocking:   => 4012
 * related:   => #11371


Comment:

 This is a symptom of #11371. I just got this:

 {{{
 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 8.1.20160121 for x86_64-unknown-linux):
         ASSERT failed!
   CallStack (from ImplicitParams):
   assertPprPanic, called at compiler/types/TyCoRep.hs:1868:61 in
 ghc:TyCoRep
   substTy, called at compiler/types/TyCoRep.hs:1799:23 in ghc:TyCoRep
   substTyWith, called at compiler/types/Type.hs:799:46 in ghc:Type
   in_scope InScope [aph :-> k1_aph]
   tenv [aph :-> k1_aph]
   cenv []
   ty (k1_aph -> *) -> (k2_apj -> *) -> Sum k1_aph k2_apj -> *
   needInScope [apj :-> k2_apj]
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11362#comment:3>
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