[GHC] #2467: orphan instance warnings are badly behaved

[GHC]

#2467: orphan instance warnings are badly behaved
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  Reporter:  duncan        |          Owner:                  
      Type:  bug           |         Status:  new             
  Priority:  normal        |      Milestone:  6.14.1          
 Component:  Compiler      |        Version:  6.8.2           
Resolution:                |       Keywords:                  
Difficulty:  Unknown       |             Os:  Unknown/Multiple
  Testcase:                |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown  |  
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Comment (by simonpj):

 There seem to be two things going on in this ticket.

  1. Do the instances in `mtl` and `array` have to include orphan
 instances?  We should investigate and fix or punt.

  2. Some reflections on orphan instances in general.  Here the discussion
 is inconclusive, so we should probably milestone as _|_, leaving the
 ticket open so that we don't lose the thoughts.

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2467#comment:14>
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