[libcxx-commits] [libcxx] [libc++] Kickstart C++29 support (PR #215820)

[via libcxx-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {darker}-->


:warning: Python code formatter, darker found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
darker --check --diff -r origin/main...HEAD libcxx/test/libcxx/feature_test_macro/std_dialects.sh.py libcxx/test/libcxx/transitive_includes.gen.py libcxx/utils/generate_feature_test_macro_components.py libcxx/utils/libcxx/test/params.py
``````````

:warning:
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
:warning:

</details>

<details>
<summary>
View the diff from darker here.
</summary>

``````````diff
--- test/libcxx/feature_test_macro/std_dialects.sh.py	2026-08-12 15:10:00.000000 +0000
+++ test/libcxx/feature_test_macro/std_dialects.sh.py	2026-08-12 15:11:49.718947 +0000
@@ -23,17 +23,11 @@
     def setUp(self):
         self.ftm = FeatureTestMacros(TEST_DATA, ["charconv"])
         self.maxDiff = None  # This causes the diff to be printed when the test fails
 
     def test_implementation(self):
-        expected = [
-            "c++17",
-            "c++20",
-            "c++23",
-            "c++26",
-            "c++29"
-        ]
+        expected = ["c++17", "c++20", "c++23", "c++26", "c++29"]
 
         self.assertEqual(self.ftm.std_dialects, expected)
 
 
 if __name__ == "__main__":

``````````

</details>


https://github.com/llvm/llvm-project/pull/215820