[Dynamo] Frozen dataclass attr access test (#159513)

Verifies https://github.com/pytorch/pytorch/issues/159424, but perhaps the issue is not fixed yet.

Pull Request resolved: https://github.com/pytorch/pytorch/pull/159513
Approved by: https://github.com/oulgen

test/dynamo/test_misc.py

@@ -10568,6 +10568,28 @@ def ___make_guard_fn():
 
         self.assertEqual(actual, expected)
 
+    def test_frozen_dataclass_attr_access(self):
+        @dataclasses.dataclass(frozen=True)
+        class TestDataClass:
+            x: torch.Tensor
+            y: torch.Tensor
+            z: int
+            a: int
+
+        def inner_fn(dc):
+            return dc.x + dc.y + dc.a + dc.z
+
+        def fn(x, y):
+            dc = TestDataClass(x, y, z=5, a=2)
+            return inner_fn(dc)
+
+        fn_opt = torch.compile(fullgraph=True)(fn)
+        inps = (torch.ones(2, 2), torch.ones(2, 2))
+        actual = fn_opt(*inps)
+        expected = fn(*inps)
+
+        self.assertEqual(actual, expected)
+
     def test_pytree_tree_leaves(self):
         implementations = [("python", python_pytree)]
         if cxx_pytree is not None: