This appendix lists currently deprecated functionality along with how to replace it.
Starting in Stan 2.29, deprecated functions with drop in replacements (such as
the renaming of
multiply_log) will be removed 3 versions later
e.g., functions deprecated in Stan 2.20 will be removed in Stan 2.23 and placed
in Removed Functions. The Stan compiler can
these on the behalf of the user for the entire deprecation window and at least
one version following the removal.