breathe doesn't pass c:function properly with a C array syntax in parameter declaration

[2bndy5]

This was discovered in #816 when resolving all warning produced by sphinx-build. So, the test project (see link below) is taken from the original breathe docs, namely examples/specific/array.h.

The C style array declared as an argument to a function is not recognized by Sphinx and is reported in the following warning:

full build log

(venv) PS path\to\C-array> sphinx-build docs docs/_build/html
Running Sphinx v4.5.0
making output directory... done
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 1 source files that are out of date
updating environment: [new config] 1 added, 0 changed, 0 removed
Running directive: .. c:function::  int bar (int n, int a[static n])

path\to\C-array\docs\index.rst.rst:13: WARNING: Parsing of expression failed. Using fallback parser. Error was:
Error in postfix expression, expected primary expression or type.
If primary expression:
  Invalid C++ declaration: Expected identifier in nested name, got keyword: static [error at 28]      
    int bar (int n, int a[static n])
    ----------------------------^
If type:
  Invalid C++ declaration: Expected identifier in nested name, got keyword: static [error at 28]      
    int bar (int n, int a[static n])
    ----------------------------^

looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100%] index
generating indices... genindex done
writing additional pages... search done
copying static files... done
copying extra files... done
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded, 1 warning.

The HTML pages are in docs\_build\html.

example project

C-array.zip

Preliminary research suggests that breathe does in fact invoke the c:function directive (notice the C domain), but something else is happening here because the warning says Invalid C++ declaration:.

[2bndy5]

I was curious, so I hard-coded an rst file with

.. c:function:: int bar(int n, int a[static [n]);

and it worked fine with sphinx. So, now I'm thinking there's something weird with how the directive is invoked in breathe.