Hi, 

On Ubuntu 22.04 running on Intel Core i7-8665U @1.9 GHz + 32 GB RAM, 
incremental parallel (-j8) build from Sage 10.0.beta4 failed while building 
the documentation. 
Running 
make doc-clean doc-uninstall
and then make again did not help. 
The issue seems to be in sage.geometry.integral_points; the full error 
message is

[sagemath_doc_html-none] [discrete_] WARNING: error while formatting 
arguments for 
sage.geometry.integral_points.InequalityCollection.are_satisfied: 
'NoneType' object has no attribute 'find'
[sagemath_doc_html-none] [discrete_] WARNING: error while formatting 
arguments for 
sage.geometry.integral_points.InequalityCollection.satisfied_as_equalities: 
'NoneType' object has no attribute 'find'
[sagemath_doc_html-none] [discrete_] WARNING: error while formatting 
arguments for sage.geometry.integral_points.loop_over_parallelotope_points: 
'NoneType' object has no attribute 'find'
[sagemath_doc_html-none] [discrete_] WARNING: error while formatting 
arguments for sage.geometry.integral_points.parallelotope_points: 
'NoneType' object has no attribute 'find'
[sagemath_doc_html-none] [discrete_] WARNING: error while formatting 
arguments for sage.geometry.integral_points.ray_matrix_normal_form: 
'NoneType' object has no attribute 'find'
[sagemath_doc_html-none] [discrete_] WARNING: error while formatting 
arguments for sage.geometry.integral_points.simplex_points: 'NoneType' 
object has no attribute 'find'
[sagemath_doc_html-none] sage --docbuild --no-pdf-links 
reference/history_and_license inventory --no-prune-empty-dirs
[sagemath_doc_html-none] [discrete_] The inventory files are in 
../../local/share/doc/sage/inventory/en/reference/discrete_geometry.
[sagemath_doc_html-none] Error building the documentation.
[sagemath_doc_html-none] Traceback (most recent call last):
[sagemath_doc_html-none]   File "/usr/lib/python3.10/runpy.py", line 196, 
in _run_module_as_main
[sagemath_doc_html-none]     return _run_code(code, main_globals, None,
[sagemath_doc_html-none]   File "/usr/lib/python3.10/runpy.py", line 86, in 
_run_code
[sagemath_doc_html-none]     exec(code, run_globals)
[sagemath_doc_html-none]   File 
"/home/eric/sage/10.0/pkgs/sage-docbuild/sage_docbuild/__main__.py", line 
498, in <module>
[sagemath_doc_html-none]     sys.exit(main())
[sagemath_doc_html-none]   File 
"/home/eric/sage/10.0/pkgs/sage-docbuild/sage_docbuild/__main__.py", line 
495, in main
[sagemath_doc_html-none]     builder()
[sagemath_doc_html-none]   File 
"/home/eric/sage/10.0/pkgs/sage-docbuild/sage_docbuild/builders.py", line 
819, in _wrapper
[sagemath_doc_html-none]     getattr(DocBuilder, build_type)(self, *args, 
**kwds)
[sagemath_doc_html-none]   File 
"/home/eric/sage/10.0/pkgs/sage-docbuild/sage_docbuild/builders.py", line 
163, in f
[sagemath_doc_html-none]     runsphinx()
[sagemath_doc_html-none]   File 
"/home/eric/sage/10.0/pkgs/sage-docbuild/sage_docbuild/sphinxbuild.py", 
line 327, in runsphinx
[sagemath_doc_html-none]     sys.stderr.raise_errors()
[sagemath_doc_html-none]   File 
"/home/eric/sage/10.0/pkgs/sage-docbuild/sage_docbuild/sphinxbuild.py", 
line 263, in raise_errors
[sagemath_doc_html-none]     raise OSError(self._error)
[sagemath_doc_html-none] OSError: WARNING: error while formatting arguments 
for sage.geometry.integral_points.InequalityCollection.are_satisfied: 
'NoneType' object has no attribute 'find'
[sagemath_doc_html-none] 
[sagemath_doc_html-none]     Note: incremental documentation builds 
sometimes cause spurious
[sagemath_doc_html-none]     error messages. To be certain that these are 
real errors, run
[sagemath_doc_html-none]     "make doc-clean doc-uninstall" first and try 
again.

Eric.

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