[GHC] #8026: DatatypeContexts should be fixed, not deprecated

[GHC]

#8026: DatatypeContexts should be fixed, not deprecated
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              Reporter:  gidyn       |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.6.3
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by goldfire):

 It seems that those of us who have hacked on GHC in the past have a hard
 time understanding this proposal -- which, to me, looks either unsound (if
 implemented simply) or very complicated (adding the ability to ''return''
 a constraint). If you want this to be considered, please write up a wiki
 page with detailed examples and types. Also, suggest how this feature
 should be implemented, in terms of a translation to GHC's core language.
 It currently all seems a little magical. Thanks!

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8026#comment:15>
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