Add user-defined superclass.

com.ibm.wala.cast.python.test/data/callables5.py

@@ -0,0 +1,13 @@
+class D:
+    pass
+
+
+class C(D):
+
+    def __call__(self, x):
+        return x * x
+
+
+c = C()
+a = c.__call__(5)
+assert a == 25

com.ibm.wala.cast.python.test/data/callables6.py

@@ -0,0 +1,13 @@
+class D:
+    pass
+
+
+class C(D):
+
+    def __call__(self, x):
+        return x * x
+
+
+c = C()
+a = c(5)
+assert a == 25

com.ibm.wala.cast.python.test/source/com/ibm/wala/cast/python/test/TestCallables.java

@@ -19,7 +19,7 @@ public class TestCallables extends TestPythonCallGraphShape {
   @Test
   public void testCallables()
       throws ClassHierarchyException, IllegalArgumentException, CancelException, IOException {
-    final String[] testFileNames = {"callables.py", "callables2.py", "callables3.py", "callables4.py"};
+    final String[] testFileNames = {"callables.py", "callables2.py", "callables3.py", "callables4.py", "callables5.py", "callables6.py"};
 
     for (String fileName : testFileNames) {
       PythonAnalysisEngine<?> E = makeEngine(fileName);