[GHC] #2395: "Pattern match(es) are overlapped" warning with a single view pattern (ghc 6.9.20080606)

[GHC]

#2395: "Pattern match(es) are overlapped" warning with a single view pattern (ghc
6.9.20080606)
-------------------------+--------------------------------------------------
    Reporter:  rwbarton  |       Owner:          
        Type:  bug       |      Status:  new     
    Priority:  normal    |   Component:  Compiler
     Version:  6.9       |    Severity:  minor   
    Keywords:            |    Testcase:          
Architecture:  x86       |          Os:  Linux   
-------------------------+--------------------------------------------------
 Compiling the program
 {{{
 {-# LANGUAGE ViewPatterns #-}

 main = print $ case 6 of
                  (even -> True) -> 4
 }}}
 yields the warning message
 {{{
 view.hs:3:15:
     Warning: Pattern match(es) are overlapped
              In a case alternative: ((even -> True)) -> ...
 }}}
 I haven't used view patterns before... but surely a single pattern can't
 overlap anything, can it?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2395>
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