set__power_intersect

[Fergus Henderson]

Hi,

Currently

	?- set__init(S0), set__power_intersect(S0, S).

will return `S = []'.  That definition doesn't make much sense to me.
I think perhaps it would be better to call error/1 in this case.

Comments?

-- 
Fergus Henderson <fjh at cs.mu.oz.au>   |  "I have always known that the pursuit
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