patch applied (ghc): Monadify deSugar/Desugar: use do, return, applicative, standard monad functions

[Ian Lynagh]

Thu Jan 17 09:41:30 PST 2008  Twan van Laarhoven <twanvl at gmail.com>
  * Monadify deSugar/Desugar: use do, return, applicative, standard monad functions

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