Hi Michael, Café. I'm writing some code using the conduit library and am encountering the following error output (while the program appears to function correctly) when using Data.Conduit.Lazy. The error given is:
profile_simple_test_data: Control.Monad.Trans.Resource.stateCleanup: There is a bug in the implementation. The mutable state is being accessed after cleanup. Please contact the maintainers.
A reduced code snippet that generates this error is (also attached):
import Control.Monad import System.Environment import Control.Monad.IO.Class (liftIO) import System.IO import Data.Conduit.Lazy import Data.List (sort)
import Data.Conduit
import Prelude hiding (map)
main = getArgs >>= process
process args = mapM_ sorted args
sorted x = runResourceT (lazyConsume $ sourceFeed x) >>= (mapM_ print . id)
sourceFeed :: ResourceIO m => FilePath -> Source m String sourceFeed file = sourceIO (openFile file ReadMode) hClose (\h -> liftIO $ do eof <- hIsEOF h if eof then return IOClosed else fmap IOOpen $ hGetLine h)
when run over any text file. I may be doing something inconsistent with the correct use of sourceIO or lazyConsume, however, I tried to follow the example at http://www.yesodweb.com/home/snoyberg/blogs/conduit/conduit/source/source.di... as closely as possible. Is this a bug, or simply an incorrect use of Conduit?