[GHC] #10733: Improving the error message for type variable ambiguity

[GHC]

#10733: Improving the error message for type variable ambiguity
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        Reporter:  Rufflewind        |                   Owner:  kanetw
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by goldfire):

 Thanks for taking this on @kanetw. The code to change should all be in
 !TcErrors. Shout if you want advice!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10733#comment:2>
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