1 files changed, 25 insertions, 0 deletions
diff --git a/testsuite/tests/rts/traceBinaryEvent.hs b/testsuite/tests/rts/traceBinaryEvent.hs
new file mode 100644
index 0000000000..c174d44bc2
--- /dev/null
+++ b/testsuite/tests/rts/traceBinaryEvent.hs
@@ -0,0 +1,25 @@
+{-# LANGUAGE MagicHash #-}
+{-# LANGUAGE UnboxedTuples #-}
+{-# LANGUAGE NumericUnderscores #-}
+{-# LANGUAGE OverloadedStrings #-}
+import Data.Word
+import GHC.Base
+import GHC.Ptr
+
+import qualified Data.ByteString as B
+import qualified Data.ByteString.Unsafe as BU
+
+main :: IO ()
+main = do
+  traceBinaryEventIO "0123456789"
+  traceBinaryEventIO $ B.replicate 10 0
+  traceBinaryEventIO $ B.replicate (maxSize + 1) 0
+
+maxSize :: Int
+maxSize = fromIntegral (maxBound :: Word16)
+
+traceBinaryEventIO :: B.ByteString -> IO ()
+traceBinaryEventIO bytes =
+  BU.unsafeUseAsCStringLen bytes $ \(Ptr p, I# n) -> IO $ \s -> do
+    case traceBinaryEvent# p n s of
+      s' -> (# s', () #)