unparse.py:  fix mispaced parentheses in chained comparisons
diff --git a/Demo/parser/test_unparse.py b/Demo/parser/test_unparse.py
index 4f3a28e..857b999 100644
--- a/Demo/parser/test_unparse.py
+++ b/Demo/parser/test_unparse.py
@@ -53,6 +53,10 @@
         self.check_roundtrip("not True or False")
         self.check_roundtrip("True or not False")
 
+    def test_chained_comparisons(self):
+        self.check_roundtrip("1 < 4 <= 5")
+        self.check_roundtrip("a is b is c is not d")
+
 
 def test_main():
     test_support.run_unittest(UnparseTestCase)