patch applied (packages/base): Improve docs for unsafeCoerce

[Simon Marlow]

Tue Apr 22 06:05:47 PDT 2008  Malcolm.Wallace at cs.york.ac.uk
  * Improve docs for unsafeCoerce
  Make it clear that compilers differ.  Point to GHC docs in GHC.Base, and
  add a short description of nhc98's representation-safe conversions.

    M ./Unsafe/Coerce.hs -2 +10

View patch online:
http://darcs.haskell.org/packages/base/_darcs/patches/20080422130547-6871e-73e8389daf43767202a117cfec691d92dd3cd027.gz