Good spot!

I think the ellipsis "keyword" can be best explained as being equivalent to

die "Unimplemented";

[download]

Edit: And the documentation says at the end of the first paragraph:

Perl throws an exception with the text Unimplemented

In reply to Re: Question about ellipsis statement '...' by Corion
in thread Question about ellipsis statement '...' by rsFalse

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