[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):

 I think the issue was a wild card pattern match gone wrong. The sharp eyes
 of @bgamari spotted it.
 The changes have been pushed to Phab. I think this patch is ready to land

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15138#comment:6>
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