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import Data.IORef
import Control.Monad
import Control.Exception
import Control.Concurrent.MVar
import System.Mem
main :: IO ()
main = do
run
run
run
run
m <- newEmptyMVar
quit m
performMajorGC
takeMVar m
run :: IO ()
run = do
ref <- newIORef ()
void $ mkWeakIORef ref $ do
putStr "."
throwIO $ ErrorCall "failed"
quit :: MVar () -> IO ()
quit m = do
ref <- newIORef ()
void $ mkWeakIORef ref $ do
putMVar m ()
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