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{-# LANGUAGE MagicHash, UnboxedTuples #-}
module Float where
import GHC.Exts
foo vs
= let w = if length (reverse vs) > 10 then Just (length vs) else Nothing
f :: State# RealWorld -> Int -> (# Int, State# RealWorld #)
f s x | Just 0 <- w = case f s (x+1) of
(# r, s' #) -> (# r, s' #)
| otherwise = (# x, s #)
in f realWorld# 1
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