[GHC] #8359: ConstraintKinds require UndecidableInstances when it doesn't need it

[GHC]

#8359: ConstraintKinds require UndecidableInstances when it doesn't need it
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        Reporter:  thomaseding                |            Owner:  simonpj
            Type:  bug                        |           Status:  new
        Priority:  normal                     |        Milestone:
       Component:  Compiler                   |          Version:  7.4.2
      Resolution:                             |         Keywords:
Operating System:  Unknown/Multiple           |     Architecture:
 Type of failure:  GHC rejects valid program  |  Unknown/Multiple
       Test Case:                             |       Difficulty:  Unknown
        Blocking:                             |       Blocked By:
                                              |  Related Tickets:
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Changes (by simonpj):

 * owner:   => simonpj


Comment:

 Excellent point, thank you.  I have a patch done; will commit when I get
 home.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8359#comment:2>
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