behaviour when sum() includes itself?

[Scott Ballantyne <sdb ssr com>]

I just had a situation where I saw a column of zero's sum() to
$6,430.60. I thought this was a gnumeric bug but then realized that
the the array I had fed to sum included the cell that held the sum()
function. Correcting that fixed the problem.

My question: shouldn't this somehow be flagged as an error? It doesn't
seem like it would ever be useful.

This is version 1.10.17 on FreeBSD 9

Thanks,
Scott