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-rw-r--r--testsuite/tests/lib/IO/hReady002.hs10
1 files changed, 10 insertions, 0 deletions
diff --git a/testsuite/tests/lib/IO/hReady002.hs b/testsuite/tests/lib/IO/hReady002.hs
new file mode 100644
index 0000000000..6db22a13fc
--- /dev/null
+++ b/testsuite/tests/lib/IO/hReady002.hs
@@ -0,0 +1,10 @@
+-- test for bug #4078
+import System.IO
+import Control.Concurrent
+import System.Exit
+
+main = do
+ m <- newEmptyMVar
+ forkIO $ do threadDelay 500000; putMVar m Nothing
+ forkIO $ do hReady stdin >>= putMVar m . Just
+ takeMVar m >>= print