test mixed boolean operations with C types and Python types

tests/run/isnonebool.pyx

@@ -14,6 +14,15 @@ __doc__ = """
     False
     >>> test_more(None, 0)
     False
+
+    >>> test_more_c(None, None)
+    True
+    >>> test_more_c(None, 1)
+    True
+    >>> test_more_c(1, None)
+    False
+    >>> test_more_c(None, 0)
+    False
 """
 
 def test_and(a,b):
@@ -21,3 +30,6 @@ def test_and(a,b):
 
 def test_more(a,b):
     return a is None and (b is None or b == 1)
+
+def test_more_c(a,b):
+    return (a is None or 1 == 2) and (b is None or b == 1)