[GHC] #15116: GHC internal error when GADT return type mentions its own constructor name

[GHC]

#15116: GHC internal error when GADT return type mentions its own constructor name
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler (Type    |              Version:  8.5
  checker)                           |             Keywords:  GADTs,
      Resolution:                    |  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * cc: goldfire (added)


Comment:

 Commit faec8d358985e5d0bf363bd96f23fe76c9e281f7 (`Track type variable
 scope more carefully.`) caused this, although it's not obvious to me from
 a quick glance why this would be the case...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15116#comment:1>
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