Haskell function. For this, it defines the MonadCatchIO class, a subset
of MonadIO. It defines proper instances for most monad transformers in
the 'mtl' library.
WWW: http://code.haskell.org/~jcpetruzza/MonadCatchIO-mtl
PR: ports/142283
Submitted by: Jacula Modyun <jacula(at)gmail.com>
