Description of the bug

When trying to document type aliases, the material/type_alias.html.jinja template raises an exception:

jinja2.exceptions.UndefinedError: 'type_alias' is undefined

(see full stack trace below)

To Reproduce

The bug seems to apply to all type alias definitions.

However, here are instructions to replicate it on one of my repos:

conda create --name delphyne-test python=3.12
conda activate delphyne-test
git clone git@github.com:jonathan-laurent/delphyne.git
cd delphyne
git checkout mkdocstrings-type-alias-bug
pip install -e ".[dev]"
mkdocs build

Full traceback

ERROR   -  Error reading page 'reference/strategies/traces.md': 'type_alias' is undefined
Traceback (most recent call last):
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/bin/mkdocs", line 8, in <module>
    sys.exit(cli())
             ^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/click/core.py", line 1082, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/click/core.py", line 1697, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/click/core.py", line 1443, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/click/core.py", line 788, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocs/__main__.py", line 288, in build_command
    build.build(cfg, dirty=not clean)
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocs/commands/build.py", line 310, in build
    _populate_page(file.page, config, files, dirty)
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocs/commands/build.py", line 167, in _populate_page
    page.render(config, files)
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocs/structure/pages.py", line 285, in render
    self.content = md.convert(self.markdown)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/markdown/core.py", line 357, in convert
    root = self.parser.parseDocument(self.lines).getroot()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/markdown/blockparser.py", line 117, in parseDocument
    self.parseChunk(self.root, '\n'.join(lines))
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/markdown/blockparser.py", line 136, in parseChunk
    self.parseBlocks(parent, text.split('\n\n'))
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/markdown/blockparser.py", line 158, in parseBlocks
    if processor.run(parent, blocks) is not False:
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocstrings/_internal/extension.py", line 128, in run
    html, handler, data = self._process_block(identifier, block, heading_level)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocstrings/_internal/extension.py", line 207, in _process_block
    rendered = render(data, options)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocstrings_handlers/python/_internal/handler.py", line 295, in render
    return template.render(
           ^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/jinja2/environment.py", line 1295, in render
    self.environment.handle_exception()
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/jinja2/environment.py", line 942, in handle_exception
    raise rewrite_traceback_stack(source=source)
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocstrings_handlers/python/templates/material/type_alias.html.jinja", line 1, in top-level template code
    {% extends "_base/type_alias.html.jinja" %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocstrings_handlers/python/templates/material/_base/type_alias.html.jinja", line 12, in top-level template code
    {% block logs scoped %}
    ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/mkdocstrings_handlers/python/templates/material/_base/type_alias.html.jinja", line 17, in block 'logs'
    {{ log.debug("Rendering " + type_alias.path) }}
  ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/jonathan/Software/miniconda3/envs/delphyne/lib/python3.12/site-packages/jinja2/environment.py", line 490, in getattr
    return getattr(obj, attribute)
           ^^^^^^^^^^^^^^^^^^^^^^^
jinja2.exceptions.UndefinedError: 'type_alias' is undefined

Environment information

python -m mkdocstrings._internal.debug  # | xclip -selection clipboard

System: macOS-14.5-arm64-arm-64bit
Python: cpython 3.12.8 (/Users/jonathan/Software/miniconda3/envs/delphyne/bin/python)
Environment variables:
Installed packages:
- mkdocstrings v0.30.0

mkdocstrings-python version: 1.18.1