On Wed, 18 May 2005, Rob Kinyon wrote:

1) undef (which may or may not contain an exception), or
2) some unit/identity value that is a trait of the operator,

depending on whether or not people think (2) is actually a good idea.

I would think that the Principle of Least Surprise points to (1),

I don't think so. I, for one, would expect [+]; to return zero and [*]; to return 1. But that's only because I {trust,expect} perl(6) to be smart enough to DWIM.

Michele -- \renewcommand\labelitemi{\textcolor{yellow}{\textbullet}} would change the colour of the first-level bullet, and improve the document so's i can't see the bullets. - Robin Fairbairns in comp.text.tex

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