stop other people wasting time on updates which should not be done.
ian@ ran into this (while working on devel/hs-aeson and
textproc/hs-attoparsec), and even I didn't notice before trying to
build all Haskell ports (including meta/haskell-platform) with his
diffs.
concurrent thread that will eventually deliver a value of type "a".
The package provides ways to create "Async" computations, wait for
their results, and cancel them.
ok sthen@
