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5ffa8f67b7
Only keep a single query for well-formed checking There are currently 3 queries to perform wf checks on different item-likes. This complexity is not required. This PR replaces the query by: - one query per item; - one query to invoke it for a whole module. This allows to remove HIR `ParItemLikeVisitor`.
For more information about how rustc works, see the rustc dev guide.