[GHC] #8278: Improve error message when the same type is imported from two different library versions

[GHC]

#8278: Improve error message when the same type is imported from two different
library versions
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        Reporter:  Yuras             |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      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 Yuras):

 And related request: in the same situation (two versions of the same
 library) when instance of class A for
 bytestring-0.9.2.1:Data.ByteString.Internal.ByteString is in scope, but
 the instance for ByteString is not in scope, is it possible to add a
 special note?

 Realworld case: http://stackoverflow.com/questions/11068272/acid-state-
 monadstate-instance-for-update

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8278#comment:2>
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