[GHC] #9822: Add displayException to Exception typeclass

[GHC]

#9822: Add displayException to Exception typeclass
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       Reporter:  snoyberg           |                   Owner:  snoyberg
           Type:  feature request    |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  libraries/base     |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Easy (less than 1  |         Type of failure:
  hour)                              |  None/Unknown
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
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 Discussed on the libraries list at:

 https://www.haskell.org/pipermail/libraries/2014-November/024176.html

 I am only implementing part (1) of this proposal due to lack of consensus
 on part (2).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9822>
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