patch applied (packages/base): check for ClosedHandle in read/write operations on DuplexHandles (#4808)

[Simon Marlow]

Wed Dec  1 02:51:14 PST 2010  Simon Marlow <marlowsd at gmail.com>
  * check for ClosedHandle in read/write operations on DuplexHandles (#4808)

    M ./GHC/IO/Handle/Internals.hs -2 +6

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=packages/base;a=darcs_commitdiff;h=20101201105114-12142-efb6c591ce2e7c72dcd100c7bec98fff6ec232ab.gz