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Logical negation #1317

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andrew-johnson-4 opened this issue Mar 5, 2025 · 1 comment

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andrew-johnson-4 commented Mar 5, 2025

let f(x: A+Not<B>): Nil;

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andrew-johnson-4 commented Mar 5, 2025 •

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Implement in unify as a "rejection"
consider, what does "returning a negation" mean?
consider, what does "accepting a function with a negation in domain or range" mean?
consider, what does "returning a function with a negation in domain or range" mean?

I think that is all cases.

Question: covariance / contravariance is implemented during unification, so would this mean only case 1 needs to be implemented?

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