[GHC] #3276: FilePath.addTrailingPathSeparator "" = "/"

[GHC]

#3276: FilePath.addTrailingPathSeparator "" = "/"
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Reporter:  duncan            |          Owner:                   
    Type:  bug               |         Status:  new              
Priority:  normal            |      Component:  libraries (other)
 Version:  6.10.2            |       Severity:  normal           
Keywords:                    |       Testcase:                   
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple 
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 Since we often consider the filepath `""` to be synonymous with `"."`,
 then `addTrailingPathSeparator ""` should be "./" not "/".

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3276>
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