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

[Ian Lynagh]

Thu Jan 17 13:32:42 PST 2008  Twan van Laarhoven <twanvl at gmail.com>
  * Monadify typecheck/TcMType: use do, return, applicative, standard monad functions

    M ./compiler/typecheck/TcMType.lhs -103 +94