[GHC] #9112: support for deriving Vector/MVector instances

[GHC]

#9112: support for deriving Vector/MVector instances
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        Reporter:  jwlato            |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by tibbe):

 Replying to [comment:7 simonpj]:
 > I have no idea what all this means.  But it looks plausible that it's
 the same issue, and is rightly rejected on the grounds that it could be
 unsound.  We have yet to figure out a way to solve this; see #9123.

 I can't tell, from the cabal message, whether cabal gave up early or
 there's in fact no install plan possible. If it's the former then cabal-
 install-1.20.0.2 (released last weekend) has several solver improvements
 that might let it find a solution that lets you build.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9112#comment:8>
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