[GHC] #15561: TypeInType: Type error conditioned on ordering of GADT and type family definitions

[GHC]

#15561: TypeInType: Type error conditioned on ordering of GADT and type family
definitions
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        Reporter:  Bj0rn             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:  TypeInType,
                                     |  TypeFamilies, GADTs
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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Comment (by mpickering):

 Perhaps related to #12088 and
 https://ghc.haskell.org/trac/ghc/wiki/InterleavingTypeInstanceChecking

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15561#comment:1>
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