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{-# OPTIONS -XRecursiveDo #-}
-- let bindings are monomorphic if used prior to their definition
module Main (main) where
import Control.Monad.Fix
t :: IO (Int, Int)
t = mdo x <- return (l "1", l [1,2,3])
let l [] = 0
l (x:xs) = 1 + l xs
return x
main :: IO ()
main = t >>= print
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