patch applied (packages/base): Add unsafeSTToIO :: ST s a -> IO a

[Simon Marlow]

Wed Mar 15 08:02:32 PST 2006  Simon Marlow <simonmar at microsoft.com>
  * Add unsafeSTToIO :: ST s a -> IO a
  Implementation for Hugs is missing, but should be easy.  We need this
  for the forthcoming nested data parallelism implementation.

    M ./Control/Monad/ST.hs -2 +3
    M ./GHC/IOBase.lhs -1 +4