Hi all! Environment: Windows Vista + SP1, GHC 6.10.1. Description: If use ghci.exe and run separate ghc.exe compiler process, memory leak in ghci occurred. After exhausting available memory Vista has no responding. Steps for reproduce: 1) After run GHCi, process list has 2 processes: ghci.exe (a), ghc.exe (b), 2) Then I run separated compilation process 20 times: Command Line: for /L %i in (1,1,20) do ghc -fforce-recomp -O --make "problem.hs" -o "problem.exe" Sample Haskell Program listing (problem.hs): main :: IO () main = do print $ [x | x <- [1..]] putStrLn "Hello, world!" 3) In process list (taskmgr.exe) I can see some processor activity and increasing value of "Memory (Private Working Set)" for process (b). 4) After run "Memory (Private Working Set)" increased about 100Mb. Best regards.