[GHC] #1351: mistake in Data.Set description

[GHC]

#1351: mistake in Data.Set description
------------------------------+---------------------------------------------
    Reporter:  guest          |        Owner:         
        Type:  bug            |       Status:  new    
    Priority:  normal         |    Milestone:         
   Component:  Documentation  |      Version:  6.6.1  
    Severity:  trivial        |   Resolution:         
    Keywords:                 |   Difficulty:  Unknown
          Os:  Windows        |     Testcase:         
Architecture:  x86            |  
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Comment (by Isaac Dupree):

 That phrase is _true_ for both functions; however it would be expected
 anyway for non-symmetric difference, which is probably why it's not said
 in regards to that function.  It is significant for intersection, where
 there is no particular reason to take the shared elements from the first
 versus the second argument (they must be in both, and intersection is
 essentially symmetric)

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1351>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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