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{-# OPTIONS_GHC -O2 #-}
-- Reading the interface file caused a black hole
-- in earlier versions of GHC
-- Also, foo should compile to very tight code with -O2
-- (The O2 was nothing to do with the black hole though.)
module ShouldCompile where
import ATLoop_help
foo :: FooT Int -> Int -> Int
foo t n = t `seq` bar n
where
bar 0 = 0
bar n | even n = bar (n `div` 2)
bar n = bar (n - int t)
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