@wds15 reported that new reserved keyword
offset in stanc3 is causing a problem https://github.com/stan-dev/stanc3/issues/453. I agree that this is a big problem as “offset” is likely name for variable, and there was no warning beforehand.
I think the list of new reserved keywords should be included in Release Notes for stan and all interfaces when they switch to stanc3. It would be good to make a separate posting warning that also people still using stanc2 should consider not using those reserved keywords. Also the list of reserved keywords in manual https://mc-stan.org/docs/2_21/reference-manual/variables-section.html should be updated.
I’m in a hurry, so I posted here instead of making issues for all the repos. I think the priority would to to post the new reserved keywords to discourse. Who can make such a list?