@CaseyCarter, @ericniebler, what do you think?

Current wording, for comparison:

The tag type dangling is used together with the template aliases borrowed_iterator_t and borrowed_subrange_t to indicate that an algorithm that typically returns an iterator into or subrange of a range argument does not return an iterator or subrange which could potentially reference a range whose lifetime has ended for a particular rvalue range argument which does not model borrowed_range (24.4.2).

LGTM

Thanks.

We should keep the (24.4.2) cross-reference for borrowed_range of course, I didn't mean to leave that out in the rewrite.

I note that we could strike the extraneous "rvalue range" from the second sentence, leaving only "is called with an argument that does not model borrowed_range", but I think the redundancy makes the paragraph more usefully tutorial. So yes, "+1 Tentatively Editorial" from me.

We could also consider adding some commas:

returns an iterator into, or subrange of, a range argument

And maybe change "could potentially reference a range" to "could potentially refer to a range".

https://www.iso.org/ISO-house-style.html says:

A sentence should not contain more than 20 words.

https://www.iso.org/ISO-house-style.html says:

A sentence should not contain more than 20 words.

I feel targeted.

Maybe you could feel "standardised" instead?