[libcxx-commits] [libcxx] [libc++] Include range access headers in `<optional>` only since C++26 (PR #214688)

[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/std/iterators/iterator.range/mandatory_inclusions.gen.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
--- mandatory_inclusions.gen.py	2026-08-07 10:55:11.000000 +0000
+++ mandatory_inclusions.gen.py	2026-08-07 10:57:51.104585 +0000
@@ -49,15 +49,17 @@
             "vector",
         ],
     )
 )
 
+
 def get_standard_mode_threshold(header):
     if header == "optional":
-        return "26" # `optional` is a range only since C++26 via P3168R2.
+        return "26"  # `optional` is a range only since C++26 via P3168R2.
     else:
-        return "0" # Other related components are ranges at first.
+        return "0"  # Other related components are ranges at first.
+
 
 for header in headers:
     print(
         f"""\
 //--- {header}.pass.cpp

``````````

</details>


https://github.com/llvm/llvm-project/pull/214688