The WHEN argument is not optional anymore (bug#64312)
Copyright-paperwork-exempt: yes
You can make two variables synonyms and declare one obsolete at the
same time using the macro @code{define-obsolete-variable-alias}.
-@defmac define-obsolete-variable-alias obsolete-name current-name &optional when docstring
+@defmac define-obsolete-variable-alias obsolete-name current-name when &optional docstring
This macro marks the variable @var{obsolete-name} as obsolete and also
makes it an alias for the variable @var{current-name}. It is
equivalent to the following: