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{-# LANGUAGE ImplicitParams, Rank2Types #-}
-- !!! Implicit parameters, and Rank-2 types
-- This one made the 5.00.1 not print anything
module Main where
foo :: ((?x :: Int) => IO a) -> Int -> IO a
-- Note the rank2 type
foo s z = do let ?x = z in s -- Should pick up ?x = z
let ?x = z+3 in s -- Ditto z+3
main = foo (print ?x) 42
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