patch applied (ghc-7.0/packages/base): Use onException for exception cleanup, and mask async exceptions

[Ian Lynagh]

Sun Dec  5 16:52:22 PST 2010  Bryan O'Sullivan <bos at serpentine.com>
  * Use onException for exception cleanup, and mask async exceptions

    M ./System/Event/Thread.hs -7 +5

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc-7.0/packages/base;a=darcs_commitdiff;h=20101206005222-00f12-7e9e02334813563e1169c8cf4b75c6832e296003.gz