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Formalize defining_use_anchor This tackles issue #57961 Introduces new enum called `DefiningAnchor` that replaces `Option<LocalDefId>` of `defining_use_anchor`. Now every use of it is explicit and exhaustively matched, catching errors like one in the linked issue. This is not a perfect fix but it's a step in the right direction. r? `@oli-obk`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.