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Migrate tests from Crown's borrow analysis and add new ones with proper assertions on demotion results. Tests cover iterative pointer demotion, inferred return provenance bounds, demotion optimality, and known limitations (struct field collapsing, interprocedural, null-ptr provenance) as #[should_panic] tests asserting correct expected behavior. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Migrate tests from Crown's borrow analysis and add new ones with proper assertions on demotion results. Tests cover iterative pointer demotion, inferred return provenance bounds, demotion optimality, and known limitations (struct field collapsing, interprocedural, null-ptr provenance) as #[should_panic] tests asserting correct expected behavior.