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-rw-r--r--testsuite/tests/rts/traceEvent.hs5
1 files changed, 5 insertions, 0 deletions
diff --git a/testsuite/tests/rts/traceEvent.hs b/testsuite/tests/rts/traceEvent.hs
index a5e19a995c..06a2b19584 100644
--- a/testsuite/tests/rts/traceEvent.hs
+++ b/testsuite/tests/rts/traceEvent.hs
@@ -1,5 +1,10 @@
+import Data.Word
import Debug.Trace
main = do
traceEventIO "testing"
traceEventIO "%s" -- see #3874
+ traceEventIO $ replicate (maxSize + 1) 'A'
+
+maxSize :: Int
+maxSize = fromIntegral (maxBound :: Word16)