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{-# LANGUAGE Haskell2010 #-}
{-# LANGUAGE Trustworthy #-}
{-# LANGUAGE FlexibleInstances #-}
-- | Trusted library that unsafe plugins can use
module SafeLang17_A where
class Pos a where
res :: a -> Bool
-- Any call to res with a list in out TCB
-- should use this method and never a more
-- specific one provided by an untrusted module
instance Pos [a] where
res _ = True
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