[GHC] #13809: TH-reified type familly and data family instances have a paucity of kinds

GHC ghc-devs at haskell.org
Sun Jun 11 23:39:28 UTC 2017


#13809: TH-reified type familly and data family instances have a paucity of kinds
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Template Haskell  |              Version:  8.0.1
      Resolution:                    |             Keywords:  TypeFamilies
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8953             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 I prefer design (1). Design (1) also jibes with a ghc-proposal I'm about
 to submit, allowing the user to write an explicit `forall` attached to any
 class/type/data instance (including equations of a closed type family).

 Others may feel differently, though.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13809#comment:3>
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