Re: mark_object crash in 22.1 and latest CVS (as of tonight)

[martin rudalics]

> The `evaporate' option is inherently dangerous since it reclaims the
> marker object forcefully without checking that nobody else is holding on
> to it, even tho it comes from a plain normal argument and the caller may
> very well have kept another ref to it somewhere.

Indeed.  I faintly recall a discussion about restricting the access to
match data.  Maybe that option was an ill-fated attempt based on the
assumption that no one was allowed to copy a reference to match data or
any of its components.

> I suggest we kill it,

Don't forget to kill it in emacs_base too.