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{-# LANGUAGE PartialTypeSignatures #-}
{-# LANGUAGE Strict #-}
{- Notes on T18223
~~~~~~~~~~~~~~~~~~
If we inline
modify' :: MonadState s m => (s -> s) -> m ()
early, before the specialiser, the casts all collapse immediately.
It turns out that fixing #21286 causes this to happen, because
we no longer w/w modify'.
If we don't inline it before the specialiser we generate
a specialised version of it. Then it gets inlined and all
the casts collapse, but we end up keeping the code for the
specialised version right through the pipeline.
-}
import Control.Monad.State
tester :: MonadState a m => m ()
tester = modify' id
-- manyState :: StateT () (StateT () IO) () -> IO ()
-- manyState :: _ -> IO ()
manyState x =
(flip evalStateT () -- 1
. flip evalStateT () -- 2
. flip evalStateT () -- 3
. flip evalStateT () -- 4
. flip evalStateT () -- 5
. flip evalStateT () -- 6
. flip evalStateT () -- 7
. flip evalStateT () -- 8
. flip evalStateT () -- 9
. flip evalStateT ()
. flip evalStateT ()
. flip evalStateT ()
. flip evalStateT ()
. flip evalStateT ()
. flip evalStateT ()
. flip evalStateT ()
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. flip evalStateT ()
. flip evalStateT ()
) x :: IO ()
main :: IO ()
main = manyState tester >>= print
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