Sphinx-exercise labels are incorrectly reported as missing

[redeboer]

The last time CI ran on the main branch (f99ed4f), there were no issues building the documentation. Now, rebuilding the docs with a trivial change (#27), the build fails and reports missing labels (see log for e663c34).

From the logs I was able to extract the following constraint files:

f99ed4f (success on `main`)

accessible-pygments==0.0.4
alabaster==0.7.13
asttokens==2.4.0
attrs==23.1.0
Babel==2.13.0
backcall==0.2.0
beautifulsoup4==4.12.2
cachetools==5.3.1
certifi==2023.7.22
chardet==5.2.0
charset-normalizer==3.3.1
click==8.1.7
colorama==0.4.6
comm==0.1.4
contourpy==1.1.1
cycler==0.12.1
debugpy==1.8.0
decorator==5.1.1
distlib==0.3.7
docutils==0.19
exceptiongroup==1.1.3
executing==2.0.0
fastjsonschema==2.18.1
filelock==3.12.4
fonttools==4.43.1
greenlet==3.0.0
idna==3.4
imagesize==1.4.1
importlib_metadata==6.8.0
ipykernel==6.25.2
ipympl==0.9.3
ipython==8.16.1
ipython-genutils==0.2.0
ipywidgets==8.1.1
jedi==0.19.1
jinja2==3.1.2
jsonschema==4.19.1
jsonschema-specifications==2023.7.1
jupyter-cache==0.6.1
jupyter-client==8.4.0
jupyter-core==5.4.0
jupyterlab-widgets==3.0.9
kiwisolver==1.4.5
markdown-it-py==2.2.0
MarkupSafe==2.1.3
matplotlib==3.8.0
matplotlib-inline==0.1.6
mdit-py-plugins==0.3.5
mdurl==0.1.2
myst-nb==0.17.2
myst-parser==0.18.1
nbclient==0.7.4
nbformat==5.9.2
nest-asyncio==1.5.8
numpy==1.26.1
packaging==23.2
parso==0.8.3
pexpect==4.8.0
pickleshare==0.7.5
pillow==10.1.0
platformdirs==3.11.0
pluggy==1.3.0
prompt-toolkit==3.0.39
psutil==5.9.6
ptyprocess==0.7.0
pure-eval==0.2.2
pydata-sphinx-theme==0.14.1
pygments==2.16.1
pyparsing==3.1.1
pyproject-api==1.6.1
python-dateutil==2.8.2
pyyaml==6.0.1
pyzmq==25.1.1
referencing==0.30.2
requests==2.31.0
rpds-py==0.10.6
six==1.16.0
snowballstemmer==2.2.0
soupsieve==2.5
sphinx==5.3.0
sphinx-book-theme==1.0.1
sphinx-comments==0.0.3
sphinx-copybutton==0.5.2
sphinx-design==0.5.0
sphinx-exercise==0.4.1
sphinx-external-toc==0.3.1
sphinx-togglebutton==0.3.2
sphinxcontrib-applehelp==1.0.7
sphinxcontrib-devhelp==1.0.5
sphinxcontrib-htmlhelp==2.0.4
sphinxcontrib-jsmath==1.0.1
sphinxcontrib-qthelp==1.0.6
sphinxcontrib-serializinghtml==1.1.9
sqlalchemy==2.0.22
stack-data==0.6.3
strong2020-salamanca==0.0.0
tabulate==0.9.0
tomli==2.0.1
tornado==6.3.3
tox==4.11.3
traitlets==5.11.2
typing-extensions==4.8.0
urllib3==2.0.7
virtualenv==20.24.6
wcwidth==0.2.8
wheel==0.41.2
widgetsnbextension==4.0.9
zipp==3.17.0

e663c34 (failure in #27)

accessible-pygments==0.0.4
alabaster==0.7.13
asttokens==2.4.1
attrs==23.1.0
Babel==2.13.1
beautifulsoup4==4.12.2
cachetools==5.3.2
certifi==2023.7.22
chardet==5.2.0
charset-normalizer==3.3.2
click==8.1.7
colorama==0.4.6
comm==0.2.0
contourpy==1.2.0
cycler==0.12.1
debugpy==1.8.0
decorator==5.1.1
distlib==0.3.7
docutils==0.19
exceptiongroup==1.1.3
executing==2.0.1
fastjsonschema==2.18.1
filelock==3.13.1
fonttools==4.44.0
greenlet==3.0.1
idna==3.4
imagesize==1.4.1
importlib_metadata==6.8.0
ipykernel==6.26.0
ipympl==0.9.3
ipython==8.17.2
ipython-genutils==0.2.0
ipywidgets==8.1.1
jedi==0.19.1
jinja2==3.1.2
jsonschema==4.19.2
jsonschema-specifications==2023.7.1
jupyter-cache==1.0.0
jupyter-client==8.6.0
jupyter-core==5.5.0
jupyterlab-widgets==3.0.9
kiwisolver==1.4.5
markdown-it-py==3.0.0
MarkupSafe==2.1.3
matplotlib==3.8.1
matplotlib-inline==0.1.6
mdit-py-plugins==0.4.0
mdurl==0.1.2
myst-nb==1.0.0
myst-parser==2.0.0
nbclient==0.9.0
nbformat==5.9.2
nest-asyncio==1.5.8
numpy==1.26.1
packaging==23.2
parso==0.8.3
pexpect==4.8.0
pillow==10.1.0
platformdirs==3.11.0
pluggy==1.3.0
prompt-toolkit==3.0.39
psutil==5.9.6
ptyprocess==0.7.0
pure-eval==0.2.2
pydata-sphinx-theme==0.14.3
pygments==2.16.1
pyparsing==3.1.1
pyproject-api==1.6.1
python-dateutil==2.8.2
pyyaml==6.0.1
pyzmq==25.1.1
referencing==0.30.2
requests==2.31.0
rpds-py==0.12.0
six==1.16.0
snowballstemmer==2.2.0
soupsieve==2.5
sphinx==6.2.1
sphinx-book-theme==1.0.1
sphinx-comments==0.0.3
sphinx-copybutton==0.5.2
sphinx-design==0.5.0
sphinx-exercise==0.4.1
sphinx-external-toc==1.0.0
sphinx-togglebutton==0.3.2
sphinxcontrib-applehelp==1.0.7
sphinxcontrib-devhelp==1.0.5
sphinxcontrib-htmlhelp==2.0.4
sphinxcontrib-jsmath==1.0.1
sphinxcontrib-qthelp==1.0.6
sphinxcontrib-serializinghtml==1.1.9
sqlalchemy==2.0.23
stack-data==0.6.3
strong2020-salamanca==0.0.0
tabulate==0.9.0
tomli==2.0.1
tornado==6.3.3
tox==4.11.3
traitlets==5.13.0
typing-extensions==4.8.0
urllib3==2.0.7
virtualenv==20.24.6
wcwidth==0.2.9
wheel==0.41.3
widgetsnbextension==4.0.9
zipp==3.17.0

The diff, generated with

git diff --no-index --unified=0 -- constraints-success.txt constraints-failure.txt | grep '^[+-]'

--- a/pip-success-f99ed4f.txt
+++ b/pip-failure-d5d8814.txt
-asttokens==2.4.0
+asttokens==2.4.1
-Babel==2.13.0
-backcall==0.2.0
+Babel==2.13.1
-cachetools==5.3.1
+cachetools==5.3.2
-charset-normalizer==3.3.1
+charset-normalizer==3.3.2
-comm==0.1.4
-contourpy==1.1.1
+comm==0.2.0
+contourpy==1.2.0
-executing==2.0.0
+executing==2.0.1
-filelock==3.12.4
-fonttools==4.43.1
-greenlet==3.0.0
+filelock==3.13.1
+fonttools==4.44.0
+greenlet==3.0.1
-ipykernel==6.25.2
+ipykernel==6.26.0
-ipython==8.16.1
+ipython==8.17.2
-jsonschema==4.19.1
+jsonschema==4.19.2
-jupyter-cache==0.6.1
-jupyter-client==8.4.0
-jupyter-core==5.4.0
+jupyter-cache==1.0.0
+jupyter-client==8.6.0
+jupyter-core==5.5.0
-markdown-it-py==2.2.0
+markdown-it-py==3.0.0
-matplotlib==3.8.0
+matplotlib==3.8.1
-mdit-py-plugins==0.3.5
+mdit-py-plugins==0.4.0
-myst-nb==0.17.2
-myst-parser==0.18.1
-nbclient==0.7.4
+myst-nb==1.0.0
+myst-parser==2.0.0
+nbclient==0.9.0
-pickleshare==0.7.5
-pydata-sphinx-theme==0.14.1
+pydata-sphinx-theme==0.14.3
-rpds-py==0.10.6
+rpds-py==0.12.0
-sphinx==5.3.0
+sphinx==6.2.1
-sphinx-external-toc==0.3.1
+sphinx-external-toc==1.0.0
-sqlalchemy==2.0.22
+sqlalchemy==2.0.23
-traitlets==5.11.2
+traitlets==5.13.0
-wcwidth==0.2.8
-wheel==0.41.2
+wcwidth==0.2.9
+wheel==0.41.3

Of interest are the updates to:

• sphinx
• pydata-sphinx-theme
• sphinx-external-toc
• myst-parser
• mdit-py-plugins