[Zpt] Built-ins and Shadows

[Todd Coram]

>  Warnings are cool.

Warnings are warm, errors are hot; clean code is cool ;-)

Where the warnings go is an interesting problem. Is there a warning/error
log in Zope? Since editing may not always be done thru the edit form (maybe
thru webdav + golive or whatever), warning feedback may be difficult. Error
is easier (munge or annotate the rendered page).

> The problem with errors is that
> if a new builtin name is ever added, then existing code that
> happens to have
> already used that name suddenly becomes illegal "for no reason at
> all" -- and
> users hate that.  The usual shadowing rules ensure that their
> code continues
> to work, albeit with new warnings; much friendlier.

What ever happened to the 'sys' prefix that was discussed?

-- todd