[GHC] #9611: Suggest the cause of "No instance" errors involving multiple versions of a package

[GHC]

#9611: Suggest the cause of "No instance" errors involving multiple versions of a
package
-------------------------------------+-------------------------------------
        Reporter:  rwbarton          |                Owner:  Yuras
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1919
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by Yuras):

 * status:  new => patch
 * differential:   => Phab:D1919


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9611#comment:4>
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