[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:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.6.3
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/should_fail/tcfail182
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by dmwit):

 Just wanted to pipe up and say I've just been hit by the problem in
 Comment 2. It seems it doesn't happen very often; but when it does happen
 it's quite confusing.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8278#comment:7>
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