1 files changed, 24 insertions, 0 deletions
diff --git a/testsuite/tests/esc/TestList.hs b/testsuite/tests/esc/TestList.hs
new file mode 100644
index 0000000000..66f9df2263
--- /dev/null
+++ b/testsuite/tests/esc/TestList.hs
@@ -0,0 +1,24 @@
+module TestList where
+
+{-# CONTRACT head1 :: {ys | not1 (null1 ys)} -> {r | True} #-}
+-- {-# CONTRACT head1 :: {xs | not (null xs)} -> {r | True} #-}
+head1 :: [Bool] -> Bool
+head1 (x:xs) = x
+
+not1 True = False
+not1 False = True
+
+null1 [] = True
+null1 xs = False
+
+{-# CONTRACT res2 :: _ #-}
+res2 = head1 [True]
+
+{-# CONTRACT res3 :: {x | True} #-}
+res3 = head1 [True]
+
+res4 = head1 []
+
+res5 = head1 [True]
+
+