[GHC] #12088: Type/data family instances in kind checking

[GHC]

#12088: Type/data family instances in kind checking
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        Reporter:  alexvieth         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11348, #12239    |  Differential Rev(s):  Phab:D2272
       Wiki Page:                    |
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Comment (by mpickering):

 I really think this exactly the same problem. The crux of this ticket is

 > (type/data) instances can depend on other (type/data) instances so we
 have to get the order right.

 #11348 goes some of the way to get the right order but doesn't account for
 dependencies between (type/data) instances.

 I am trying to write up these discussions on a wiki page as it is very
 messy currently.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12088#comment:22>
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