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1. mutVarFromSTRef :: STRef s a -> MutVar s a

   classy-prelude-yesod	ClassyPrelude.Yesod

   Convert MutVar to STRef

2. mutVarToIORef :: MutVar RealWorld a -> IORef a

   classy-prelude-yesod	ClassyPrelude.Yesod

   Convert MutVar to IORef

3. mutVarToSTRef :: MutVar s a -> STRef s a

   classy-prelude-yesod	ClassyPrelude.Yesod

   Convert MutVar to STRef

4. newMutVar :: PrimMonad m => a -> m (MutVar (PrimState m) a)

   classy-prelude-yesod	ClassyPrelude.Yesod

   Create a new MutVar with the specified initial value.

5. newTVar :: a -> STM (TVar a)

   classy-prelude-yesod	ClassyPrelude.Yesod

   Create a new TVar holding a value supplied

6. newTVarIO :: MonadIO m => a -> m (TVar a)

   classy-prelude-yesod	ClassyPrelude.Yesod

   Lifted version of newTVarIO

7. readMutVar :: PrimMonad m => MutVar (PrimState m) a -> m a

   classy-prelude-yesod	ClassyPrelude.Yesod

   Read the value of a MutVar.

8. readTVar :: TVar a -> STM a

   classy-prelude-yesod	ClassyPrelude.Yesod

   Return the current value stored in a TVar.

9. readTVarIO :: MonadIO m => TVar a -> m a

   classy-prelude-yesod	ClassyPrelude.Yesod

   Lifted version of readTVarIO

10. stateTVar :: TVar s -> (s -> (a, s)) -> STM a

    classy-prelude-yesod	ClassyPrelude.Yesod

    Like modifyTVar' but the function is a simple state transition that can return a side value which is passed on as the result of the STM.

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