如何通过sphinx链接到Python 3文档中的typecontextmanager标签

https://docs.python.org/3/library/stdtypes.html#typecontextmanager . 我正在尝试使用 :ref:

我跑了 python -m sphinx.ext.intersphinx https://docs.python.org/3/objects.inv . 结果表明,除其他外:

...
std:label
    23acks                    Acknowledgements             : whatsnew/2.3.html#acks
    23section-other           Other Changes and Fixes      : whatsnew/2.3.html#section-other
...
    typebytearray             Bytearray Objects            : library/stdtypes.html#typebytearray
    typebytes                 Bytes Objects                : library/stdtypes.html#typebytes
    typecontextmanager        Context Manager Types        : library/stdtypes.html#typecontextmanager
    typeiter                  Iterator Types               : library/stdtypes.html#typeiter
    typememoryview            Memory Views                 : library/stdtypes.html#typememoryview
...

intersphinx_mapping

intersphinx_mapping = {
    'python': ('https://docs.python.org/3', None),
}

我使用以下指令:

:ref:`context manager <python:typecontextmanager>`

这似乎指向了正确的标签,但我得到了以下警告:

WARNING: undefined label: python:typecontextmanager (if the link has no caption the label must precede a section header)

:参考: 被字符串替换 context manager

我错过了什么?

注1

:ref:`with <python:with>` ,应该指向 https://docs.python.org/3/reference/compound_stmts.html#with std:label

     with                       The with statement          : reference/compound_stmts.html#with

可能不是百分之百相关,但我可以链接到 :py:meth:`~contextmanager.__enter__`