patch applied (ghc-6.12/ghc): Fix Trac #3964: view patterns in DsArrows

[Ian Lynagh]

Fri Apr  9 09:55:57 PDT 2010  simonpj at microsoft.com
  * Fix Trac #3964: view patterns in DsArrows
  
  Just a missing case; I've eliminated the catch-all so 
  that we get a warning next time we extend HsPat

    M ./compiler/deSugar/DsArrows.lhs -1 +2

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc-6.12/ghc;a=darcs_commitdiff;h=20100409165557-1287e-32cd8e66562f1f43512b9a2349740714822f1443.gz