[GHC] #3699: Wildcards in type functions

[GHC]

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

 How would we resolve things like
 {{{#!hs
   type instance Testing (f :>: _) = MyType f
   type instance Testing (_ :>: g) = MyType g
 }}}
 and other such collisions?

 I'm pretty new to GHC - is there an existing resolution order from
 elsewhere that could be borrowed for this?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3699#comment:14>
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