[GHC] #8809: Prettier error messages?

[GHC]

#8809: Prettier error messages?
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        Reporter:  joelteon          |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.9
      Resolution:                    |             Keywords:
                                     |  TypeErrorMessages
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:  13122
 Related Tickets:                    |  Differential Rev(s):
  #8809,#10073,#10179,#12906,#13670  |
       Wiki Page:                    |
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Comment (by simonpj):

 Good background reading above, in comment:12, 13, 22.  Maybe a bunch of
 dynamics is what we want, or maybe info in the `SDoc` itself, or both

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8809#comment:81>
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