patch applied (ghc): Make DsArrows warning-free

[Ian Lynagh]

Sun May  4 07:04:43 PDT 2008  Ian Lynagh <igloo at earth.li>
  * Make DsArrows warning-free

    M ./compiler/deSugar/DsArrows.lhs -25 +33
    M ./compiler/hsSyn/HsExpr.lhs +3

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20080504140443-3fd76-444e0f18c209e66ed225591e2bf39e07c2e2add6.gz