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We now make `'empty` indexed by a universe index, resulting in a region lattice like this: ``` static ----------+-----...------+ (greatest) | | | early-bound and | | free regions | | | | | scope regions | | | | | empty(root) placeholder(U1) | | / | | / placeholder(Un) empty(U1) -- / | / ... / | / empty(Un) -------- (smallest) ``` Therefore, `exists<A> { forall<B> { B: A } }` is now unprovable, because A must be at least Empty(U1) and B is placeholder(U2), and hence the two regions are unrelated.
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