Compute has_pub_restricted in the resolver.

compiler/rustc_middle/src/ty/mod.rs

@@ -131,6 +131,8 @@ pub struct ResolverOutputs {
     pub definitions: rustc_hir::definitions::Definitions,
     pub cstore: Box<CrateStoreDyn>,
     pub visibilities: FxHashMap<LocalDefId, Visibility>,
+    /// This field is used to decide whether we should make `PRIVATE_IN_PUBLIC` a hard error.
+    pub has_pub_restricted: bool,
     pub access_levels: AccessLevels,
     pub extern_crate_map: FxHashMap<LocalDefId, CrateNum>,
     pub maybe_unused_trait_imports: FxHashSet<LocalDefId>,

compiler/rustc_privacy/src/lib.rs

@@ -1661,7 +1661,6 @@ struct SearchInterfaceForPrivateItemsVisitor<'tcx> {
     item_def_id: LocalDefId,
     /// The visitor checks that each component type is at least this visible.
     required_visibility: ty::Visibility,
-    has_pub_restricted: bool,
     has_old_errors: bool,
     in_assoc_ty: bool,
 }
@@ -1750,7 +1749,10 @@ impl SearchInterfaceForPrivateItemsVisitor<'_> {
             };
             let make_msg = || format!("{} {} `{}` in public interface", vis_descr, kind, descr);
             let span = self.tcx.def_span(self.item_def_id.to_def_id());
-            if self.has_pub_restricted || self.has_old_errors || self.in_assoc_ty {
+            if self.has_old_errors
+                || self.in_assoc_ty
+                || self.tcx.resolutions(()).has_pub_restricted
+            {
                 let mut err = if kind == "trait" {
                     struct_span_err!(self.tcx.sess, span, E0445, "{}", make_msg())
                 } else {
@@ -1809,7 +1811,6 @@ impl<'tcx> DefIdVisitor<'tcx> for SearchInterfaceForPrivateItemsVisitor<'tcx> {
 
 struct PrivateItemsInPublicInterfacesVisitor<'tcx> {
     tcx: TyCtxt<'tcx>,
-    has_pub_restricted: bool,
     old_error_set_ancestry: LocalDefIdSet,
 }
 
@@ -1823,7 +1824,6 @@ impl<'tcx> PrivateItemsInPublicInterfacesVisitor<'tcx> {
             tcx: self.tcx,
             item_def_id: def_id,
             required_visibility,
-            has_pub_restricted: self.has_pub_restricted,
             has_old_errors: self.old_error_set_ancestry.contains(&def_id),
             in_assoc_ty: false,
         }
@@ -2061,13 +2061,6 @@ fn check_private_in_public(tcx: TyCtxt<'_>, (): ()) {
     };
     tcx.hir().walk_toplevel_module(&mut visitor);
 
-    let has_pub_restricted = tcx.resolutions(()).visibilities.iter().any(|(&def_id, &v)| match v {
-        ty::Visibility::Public | ty::Visibility::Invisible => false,
-        ty::Visibility::Restricted(module) => {
-            module != tcx.parent_module_from_def_id(def_id).to_def_id()
-        }
-    });
-
     let mut old_error_set_ancestry = HirIdSet::default();
     for mut id in visitor.old_error_set.iter().copied() {
         loop {
@@ -2085,7 +2078,6 @@ fn check_private_in_public(tcx: TyCtxt<'_>, (): ()) {
     // Check for private types and traits in public interfaces.
     let mut visitor = PrivateItemsInPublicInterfacesVisitor {
         tcx,
-        has_pub_restricted,
         // Only definition IDs are ever searched in `old_error_set_ancestry`,
         // so we can filter away all non-definition IDs at this point.
         old_error_set_ancestry: old_error_set_ancestry

compiler/rustc_resolve/src/build_reduced_graph.rs

@@ -265,6 +265,8 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
                 })
             }
             ast::VisibilityKind::Restricted { ref path, id, .. } => {
+                // Make `PRIVATE_IN_PUBLIC` lint a hard error.
+                self.r.has_pub_restricted = true;
                 // For visibilities we are not ready to provide correct implementation of "uniform
                 // paths" right now, so on 2018 edition we only allow module-relative paths for now.
                 // On 2015 edition visibilities are resolved as crate-relative by default,

compiler/rustc_resolve/src/lib.rs

@@ -934,6 +934,7 @@ pub struct Resolver<'a> {
     glob_map: FxHashMap<LocalDefId, FxHashSet<Symbol>>,
     /// Visibilities in "lowered" form, for all entities that have them.
     visibilities: FxHashMap<LocalDefId, ty::Visibility>,
+    has_pub_restricted: bool,
     used_imports: FxHashSet<NodeId>,
     maybe_unused_trait_imports: FxHashSet<LocalDefId>,
     maybe_unused_extern_crates: Vec<(LocalDefId, Span)>,
@@ -1313,6 +1314,7 @@ impl<'a> Resolver<'a> {
 
             glob_map: Default::default(),
             visibilities,
+            has_pub_restricted: false,
             used_imports: FxHashSet::default(),
             maybe_unused_trait_imports: Default::default(),
             maybe_unused_extern_crates: Vec::new(),
@@ -1423,6 +1425,7 @@ impl<'a> Resolver<'a> {
         let proc_macros = self.proc_macros.iter().map(|id| self.local_def_id(*id)).collect();
         let definitions = self.definitions;
         let visibilities = self.visibilities;
+        let has_pub_restricted = self.has_pub_restricted;
         let extern_crate_map = self.extern_crate_map;
         let reexport_map = self.reexport_map;
         let maybe_unused_trait_imports = self.maybe_unused_trait_imports;
@@ -1435,6 +1438,7 @@ impl<'a> Resolver<'a> {
             definitions,
             cstore: Box::new(self.crate_loader.into_cstore()),
             visibilities,
+            has_pub_restricted,
             access_levels,
             extern_crate_map,
             reexport_map,
@@ -1461,6 +1465,7 @@ impl<'a> Resolver<'a> {
             access_levels: self.access_levels.clone(),
             cstore: Box::new(self.cstore().clone()),
             visibilities: self.visibilities.clone(),
+            has_pub_restricted: self.has_pub_restricted,
             extern_crate_map: self.extern_crate_map.clone(),
             reexport_map: self.reexport_map.clone(),
             glob_map: self.glob_map.clone(),