[GHC] #7913: Argument order not preserved by nubBy

[GHC]

#7913: Argument order not preserved by nubBy
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  Reporter:  paullik       |          Owner:                  
      Type:  bug           |         Status:  new             
  Priority:  normal        |      Milestone:                  
 Component:  Prelude       |        Version:  7.6.3           
Resolution:                |       Keywords:  nubBy           
        Os:  Linux         |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown  |     Difficulty:  Unknown         
  Testcase:                |      Blockedby:                  
  Blocking:                |        Related:                  
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Changes (by simonpj):

  * status:  closed => new
  * resolution:  duplicate =>


Comment:

 I see; I'd missed that.  We can do one of two things
  * Simple: change documentation of the "reference" implementation to
 reverse order of args to `eq`.  But (a) reference impl differs from
 Report; (b) the back to front code is a bit unintuitive.
  * Still easy: change the order of args in both `elem_by` ''and'' in
 `nub`, so that the impl matches the reference impl.  This is what #2528
 should have done in the first place.  Disadvantage: it's a change.
  * Simplest: do nothing

 Library folk, what do you want?

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7913#comment:3>
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