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Take a LocalDefId in expect_*item. Items and item-likes are always HIR owners. When trying to find such nodes, there is no ambiguity, the `LocalDefId` and the `HirId::owner` always match. In such cases, `local_def_id_to_hir_id` does not carry any meaningful information, so we can just skip calling it altogether.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.