@zygoloid , the remaining hanging paragraphs are:

\rSec1[expr.prim]{Primary expressions}% <-- Hanging paragraph follows
\rSec2[fpos]{Class template \tcode{fpos}} <-- Hanging paragraph follows
\rSec3[back.insert.iterator]{Class template \tcode{back_insert_iterator}} <-- Hanging paragraph follows
\rSec3[front.insert.iterator]{Class template \tcode{front_insert_iterator}} <-- Hanging paragraph follows
\rSec3[insert.iterator]{Class template \tcode{insert_iterator}} <-- Hanging paragraph follows
\rSec3[locale.time.put]{Class template \tcode{time_put}} <-- Hanging paragraph follows
\rSec3[locale.money.get]{Class template \tcode{money_get}} <-- Hanging paragraph follows
\rSec3[locale.money.put]{Class template \tcode{money_put}} <-- Hanging paragraph follows
\rSec3[coroutine.handle.noop]{Class \tcode{coroutine_handle<noop_coroutine_promise>}} <-- Hanging paragraph follows
\rSec2[tuple.tuple]{Class template \tcode{tuple}} <-- Hanging paragraph follows

This is mostly standard library class synopses etc. There is no \pnum, so your script didn't detect them.

This is mostly standard library class synopses etc. There is no \pnum, so your script didn't detect them.

I intentionally skipped these. If there are no paragraphs, then I think by definition there are no hanging paragraphs, and I don't think we want subclauses containing no paragraph numbers. The check I wanted was "is there a \pnum between two \rSecs with increasing level?"

That said: in the longer term (for C++23) it would be a good idea to fix these remaining cases.