[GHC] #8809: Prettier error messages?

[GHC]

#8809: Prettier error messages?
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        Reporter:  joelteon          |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.9
      Resolution:                    |             Keywords:
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         |
       Wiki Page:                    |
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Comment (by Iceland_jack):

 Ideas from ignorance: Apply technique from
 [https://arxiv.org/abs/1610.04799 Trees That Grow] + index something by
 the type it generates or by sublanguage (where "efficiency" might well be
 a sublanguage of `pretty`)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8809#comment:62>
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