Re: using empty_string as the only "" string

[Dmitry Antipov]

Richard Stallman wrote:
>     Also note that canonicalization of null strings assumes that
>     non-null interval can't be attached to empty string regardless of
>     it's multibyteness (at a first glance, this is how the stuff ticks
>     now, but I'm not sure about this).
>
> Alas, I don't understand those words.

Is it possible that STRING_INTERVALS(s) is not NULL if 's' is an empty string,
unibyte or multibyte ? I believe no (at least, 'set-text-properties' can't
attach properties to empty string).

Otherwise it would be nearly impossible to canonicalize empty strings since each
empty string may have unique intervals.

Dmitry