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Distinct target variable names exposed a replacement-condition scope lift that source-derived names had masked. Keep those variables under the replacement existential.
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Require every ownable top-level symbol to be introduced by a dedicated owner before it can appear in facts. Reject duplicate ownership and prevent symbols used by inductive definitions from being defined later.
Use the ownership/dependency information to reject hidden recursive inductive definitions and to generate referenceable inductive principles.
BREAKING CHANGE: Top-level facts no longer introduce symbols implicitly.
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Still some `<nowhere>` value as placeholder left over.
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