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858b82da3b
Add a HasAttrs<'tcx, Tcx> trait to rustc_hir that allows find_attr! to accept DefId, LocalDefId, OwnerId, and HirId directly, instead of requiring callers to manually fetch the attribute slice first. The trait is defined in rustc_hir with a generic Tcx parameter to avoid a dependency cycle (rustc_hir cannot depend on rustc_middle). The four concrete impls for TyCtxt are in rustc_middle.