[GHC] #15138: Unable to instantiate data members of kind Nat in backpack signatures.

[GHC]

#15138: Unable to instantiate data members of kind Nat in backpack signatures.
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        Reporter:  ppk               |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.1
      Resolution:                    |             Keywords:  backpack
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4951
       Wiki Page:                    |
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Comment (by ppk):

 @bgamari now that the patch is not failing the tests can you schedule this
 for ghc-8.6 instead of ghc-8.8. Please also consider #15379 if that is the
 case as without it, this patch alone will not
 be as useful. We had this discussion on IRC but I am putting it here for
 documentation.
 Thanks for spotting that bug in any case.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15138#comment:7>
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