[GHC] #1985: IntSet.deleteMin doesn't agree with Set.deleteMin

[GHC]

#1985: IntSet.deleteMin doesn't agree with Set.deleteMin
----------------------------------+-----------------------------------------
    Reporter:  dbenbenn           |       Owner:          
        Type:  bug                |      Status:  new     
    Priority:  normal             |   Milestone:          
   Component:  libraries (other)  |     Version:  6.8.1   
    Severity:  normal             |    Keywords:          
  Difficulty:  Unknown            |    Testcase:          
Architecture:  Multiple           |          Os:  Multiple
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 (!IntSet.deleteMin !IntSet.empty) is error, while (Set.deleteMin Set.empty
 == Set.empty).  Set and !IntSet should have identical behavior whenever
 possible (so that Set Int can be replaced by !IntSet without introducing
 bugs).

 Since !IntSet.deleteMin is newer, presumably it should be changed to agree
 with Set.deleteMin.

 The same issue applies to !IntSet.deleteMax, (snd .
 !IntSet.deleteFindMin), and (snd . !IntSet.deleteFindMax).  Also
 Data.!IntMap.

 This behavior was introduced in ticket 1229.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1985>
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