1 files changed, 12 insertions, 0 deletions
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 2ea97e7..d884f54 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -2607,6 +2607,7 @@ class TestType(unittest.TestCase):
         self.assertEqual(A.__module__, __name__)
         self.assertEqual(A.__bases__, (object,))
         self.assertIs(A.__base__, object)
+        self.assertNotIn('__firstlineno__', A.__dict__)
         x = A()
         self.assertIs(type(x), A)
         self.assertIs(x.__class__, A)
@@ -2685,6 +2686,17 @@ class TestType(unittest.TestCase):
             A.__qualname__ = b'B'
         self.assertEqual(A.__qualname__, 'D.E')
 
+    def test_type_firstlineno(self):
+        A = type('A', (), {'__firstlineno__': 42})
+        self.assertEqual(A.__name__, 'A')
+        self.assertEqual(A.__module__, __name__)
+        self.assertEqual(A.__dict__['__firstlineno__'], 42)
+        A.__module__ = 'testmodule'
+        self.assertEqual(A.__module__, 'testmodule')
+        self.assertNotIn('__firstlineno__', A.__dict__)
+        A.__firstlineno__ = 43
+        self.assertEqual(A.__dict__['__firstlineno__'], 43)
+
     def test_type_typeparams(self):
         class A[T]:
             pass