docs: guard frozendict doc entries behind py315 Sphinx tag

ReadTheDocs builds with Python 3.13 where `treespec_frozendict` does not
exist. Use `.. only:: py315` directive to conditionally include the
autosummary and autofunction entries, with the tag set in conf.py based
on `sys.version_info >= (3, 15)`.

Author: XuehaiPan

docs/source/conf.py

@@ -79,6 +79,9 @@ def get_version() -> str:
 if not os.getenv('READTHEDOCS', None):
     extensions.append('sphinxcontrib.spelling')
 
+if sys.version_info >= (3, 15):
+    tags.add('py315p')  # noqa: F821  # `tags` is a Sphinx built-in
+
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
 

docs/source/ops.rst

@@ -150,7 +150,6 @@ Tree Reduce Functions
     treespec_defaultdict
     treespec_deque
     treespec_structseq
-    treespec_frozendict
     treespec_from_collection
 
 .. autofunction:: treespec_paths
@@ -176,5 +175,9 @@ Tree Reduce Functions
 .. autofunction:: treespec_defaultdict
 .. autofunction:: treespec_deque
 .. autofunction:: treespec_structseq
-.. autofunction:: treespec_frozendict
+
+.. only:: py315p
+
+    .. autofunction:: treespec_frozendict
+
 .. autofunction:: treespec_from_collection

docs/source/treespec.rst

@@ -22,5 +22,13 @@ Check section :ref:`PyTreeSpec Functions` for more detailed documentation.
     defaultdict
     deque
     structseq
-    frozendict
+
+.. only:: py315p
+
+    .. autosummary::
+
+        frozendict
+
+.. autosummary::
+
     from_collection