module Hugs.IORef ( IORef -- abstract, instance of: Eq , newIORef -- :: a -> IO (IORef a) , readIORef -- :: IORef a -> IO a , writeIORef -- :: IORef a -> a -> IO () ) where data IORef a -- mutable variables containing values of type a primitive newIORef "newRef" :: a -> IO (IORef a) primitive readIORef "getRef" :: IORef a -> IO a primitive writeIORef "setRef" :: IORef a -> a -> IO () primitive eqIORef "eqRef" :: IORef a -> IORef a -> Bool instance Eq (IORef a) where (==) = eqIORef
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