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-- !!! Test filter fusion
-- In GHC 4.06, the filterFB rule was back to front, which
-- made this program hit the "error foo" case instead of
-- working fine.
module Main where
main :: IO ()
main = print (length (filter (not . foo)
(filter (const False) [Nothing])))
where foo (Just x) = x
foo _ = error "foo"
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