Fix the test case.

Author: ZeroIntensity

Lib/test/test_interpreters/test_api.py

@@ -2377,6 +2377,7 @@ def foo(self):
         obj = Unshareable()
         self.assertFalse(_interpreters.is_shareable(obj))
         self.assertFalse(is_pickleable(obj))
+        return obj
 
     def test_simple_proxy(self):
         interp = interpreters.create()