1 files changed, 16 insertions, 0 deletions
diff --git a/testsuite/tests/deSugar/should_run/dsrun013.hs b/testsuite/tests/deSugar/should_run/dsrun013.hs
new file mode 100644
index 0000000000..c9cc59ead9
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+++ b/testsuite/tests/deSugar/should_run/dsrun013.hs
@@ -0,0 +1,16 @@
+{-# LANGUAGE UnboxedTuples #-}
+
+-- This one killed GHC 6.4.1, because the pattern match on the
+-- unboxed tuple generates a failure case, which defeated the
+-- rather fragile code in the desugarer
+-- See DsExpr.lhs, the HsCase case
+
+module Main where
+
+foo xs ys = case (# null xs, null ys #) of
+              (# True, False #) -> "One"
+              (# False, True #) -> "Two"
+
+main :: IO ()
+main = print (foo [] "ok")
+