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Andreas Stenius wrote:
> I've begun a small attempt at a class system implemented with token
> filters.
> Find it here:
> This one requires the new token filter patch from lhf.

I'd prefer that token filters use the convention of a $ prefix for any
added keywords (e.g. $class).  Rationale:

    * makes it clear that the keyword is an extension
    * avoids clash with identifiers in an existing program
    * avoids clash with future real keywords