diff -r 752b59a9b9cd Lib/unittest/loader.py
--- a/Lib/unittest/loader.py	Mon Jul 27 16:48:42 2015 +0300
+++ b/Lib/unittest/loader.py	Mon Jul 27 14:23:45 2015 -0700
@@ -119,7 +119,9 @@
         tests = []
         for name in dir(module):
             obj = getattr(module, name)
-            if isinstance(obj, type) and issubclass(obj, case.TestCase):
+            if (isinstance(obj, type) and
+                  issubclass(obj, case.TestCase) and
+                  obj is not case.FunctionTestCase):
                 tests.append(self.loadTestsFromTestCase(obj))
 
         load_tests = getattr(module, 'load_tests', None)
@@ -188,11 +190,14 @@
 
         if isinstance(obj, types.ModuleType):
             return self.loadTestsFromModule(obj)
-        elif isinstance(obj, type) and issubclass(obj, case.TestCase):
+        elif (isinstance(obj, type) and
+              issubclass(obj, case.TestCase) and
+              obj is not case.FunctionTestCase):
             return self.loadTestsFromTestCase(obj)
         elif (isinstance(obj, types.FunctionType) and
               isinstance(parent, type) and
-              issubclass(parent, case.TestCase)):
+              issubclass(parent, case.TestCase) and
+              obj is not case.FunctionTestCase):
             name = parts[-1]
             inst = parent(name)
             # static methods follow a different path
diff -r 752b59a9b9cd Lib/unittest/test/test_loader.py
--- a/Lib/unittest/test/test_loader.py	Mon Jul 27 16:48:42 2015 +0300
+++ b/Lib/unittest/test/test_loader.py	Mon Jul 27 14:23:45 2015 -0700
@@ -147,7 +147,19 @@
 
         self.assertEqual(list(suite), [loader.suiteClass()])
 
-    # "This method searches `module` for classes derived from TestCase"s
+    # "This method searches `module` for classes derived from TestCase"
+    #
+    # What happens if FunctionTestCase is found?
+    def test_loadTestsFromModule__has_FunctionTestCase(self):
+        m = types.ModuleType('m')
+        m.testcase_1 = unittest.FunctionTestCase
+
+        loader = unittest.TestLoader()
+        suite = loader.loadTestsFromModule(m)
+        self.assertIsInstance(suite, loader.suiteClass)
+        self.assertEqual(list(suite), [])
+
+    # "This method searches `module` for classes derived from TestCase"
     #
     # What happens if loadTestsFromModule() is given something other
     # than a module?