Divide by zero

[bill.daly@tradition.co.uk (Bill Daly)]

I had a divide-by-zero bug in GP which PARI didn't report as an error.
Out of curiosity, I typed the expression (3-3)/(2-2) on the GP command
line, and PARI reported to answer as 0, rather than signalling a
divide-by-zero error. This looks like a bit of excessive optimization.

Regards,

Bill
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