This warning is emitted because RefrectionReference has no constructor page.
XPointer evaluation failed: #xmlns(db=http://docbook.org/ns/docbook)
xpointer(id('class.reflectionreference')/db:refentry/db:refsect1[@role='description']/descendant::db:constructorsynopsis[not(@role='procedural')])
done.
We also document the new `$filter` parameter for the `ReflectionClass`
methods `::getConstants()` and `::getReflectionConstants()` and the
respective constants.
Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>
Closes GH-298.
