1 files changed, 25 insertions, 0 deletions
diff --git a/testsuite/tests/stranal/should_run/T16197.hs b/testsuite/tests/stranal/should_run/T16197.hs
new file mode 100644
index 0000000000..a1ab333d10
--- /dev/null
+++ b/testsuite/tests/stranal/should_run/T16197.hs
@@ -0,0 +1,25 @@
+import System.IO.Unsafe (unsafePerformIO)
+
+data T = T !Bool
+data Box a = Box a
+
+f :: Int -> T -> Box Bool
+f n t
+  | n <= 0 = case t of
+      T b -> Box b
+  | otherwise = f (n-2) t
+
+f1 :: Int -> Bool -> Box Bool
+f1 n t
+  | n <= 0 = f (-n) $! T t
+  | otherwise = f1 (n-2) t
+
+g :: Int -> Bool
+g k = if k <= 0
+        then unsafePerformIO (putStrLn "Evaluated True" >> return True)
+        else unsafePerformIO (putStrLn "Evaluated False" >> return False)
+{-# NOINLINE g #-}
+
+main :: IO ()
+main = case f1 4 (g 0) of
+    Box _ -> return ()