darcs patch: Add justIf to Data.Maybe

[Joachim Breitner]

Hi,

I propose the attached change, with a discussion timeframe until end of
September. The corresponding ticket is
http://hackage.haskell.org/trac/ghc/ticket/3446

Thanks,
Joachim


Fri Aug 21 19:17:12 CEST 2009  Joachim Breitner <mail at joachim-breitner.de>
  * Add justIf to Data.Maybe

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