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

[GHC]

#8026: DatatypeContexts should be fixed, not deprecated
-------------------------------+--------------------------------------------
  Reporter:  gidyn             |          Owner:                  
      Type:  feature request   |         Status:  closed          
  Priority:  normal            |      Milestone:                  
 Component:  Compiler          |        Version:  7.6.3           
Resolution:  wontfix           |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------
Changes (by simonpj):

  * status:  new => closed
  * difficulty:  => Unknown
  * resolution:  => wontfix


Comment:

 We already have a notation for the "fixed" version:
 {{{
 data Foo a where
   Foo :: Eq a => a -> Foo a
 }}}
 Moreover, this is arguably the "right" notation because you can vary the
 context per-constructor:
 {{{
 data Bar a where
   Bar1 :: Eq a => a -> Bar a
   Bar2 :: (Ix a, Show a) => a -> a -> Bar a
 }}}

 You may want to make suggesitons to the Haskell Prime group, but I'm
 disinclined to add yet new behaviour to GHC when an existing solution does
 the job.

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/8026#comment:1>
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