[GHC] #3699: Wildcards in type functions

[GHC]

#3699: Wildcards in type functions
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        Reporter:                    |                   Owner:  msosn
  MartijnVanSteenbergen              |
            Type:  feature request   |                  Status:  new
        Priority:  low               |               Milestone:  7.12.1
       Component:  Compiler (Type    |                 Version:  6.10.4
  checker)                           |
      Resolution:                    |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1092
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Comment (by thomasw):

 Fixing #10586 led me to add support for wild cards in type/data family
 instance declarations, see Phab:D1092.

 @msosn: Sorry for stealing this. As I implemented partial type signatures
 in the first place, this was less than an hour's worth of work for me.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3699#comment:23>
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