patch applied (packages/base): add readTVarIO :: TVar a -> IO a

[Simon Marlow]

Fri Oct 10 04:38:35 PDT 2008  Simon Marlow <marlowsd at gmail.com>
  * add readTVarIO :: TVar a -> IO a

    M ./GHC/Conc.lhs +11

View patch online:
http://darcs.haskell.org/packages/base/_darcs/patches/20081010113835-12142-ceb8a7a2940a8d77a73b17263bc382d93d228d1a.gz