Add `warn(unreachable_pub)` to `rustc_passes`.

compiler/rustc_passes/src/debugger_visualizer.rs

@@ -95,6 +95,6 @@ fn debugger_visualizers(tcx: TyCtxt<'_>, _: LocalCrate) -> Vec<DebuggerVisualize
     visitor.visualizers
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     providers.debugger_visualizers = debugger_visualizers;
 }

compiler/rustc_passes/src/diagnostic_items.rs

@@ -90,7 +90,7 @@ fn all_diagnostic_items(tcx: TyCtxt<'_>, (): ()) -> DiagnosticItems {
     items
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     providers.diagnostic_items = diagnostic_items;
     providers.all_diagnostic_items = all_diagnostic_items;
 }

compiler/rustc_passes/src/lang_items.rs

@@ -359,6 +359,6 @@ impl<'ast, 'tcx> visit::Visitor<'ast> for LanguageItemCollector<'ast, 'tcx> {
     }
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     providers.get_lang_items = get_lang_items;
 }

compiler/rustc_passes/src/lib.rs

@@ -12,6 +12,7 @@
 #![feature(map_try_insert)]
 #![feature(rustdoc_internals)]
 #![feature(try_blocks)]
+#![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
 use rustc_middle::query::Providers;

compiler/rustc_passes/src/lib_features.rs

@@ -16,7 +16,7 @@ use rustc_span::{sym, Span};
 
 use crate::errors::{FeaturePreviouslyDeclared, FeatureStableTwice};
 
-pub struct LibFeatureCollector<'tcx> {
+struct LibFeatureCollector<'tcx> {
     tcx: TyCtxt<'tcx>,
     lib_features: LibFeatures,
 }
@@ -153,6 +153,6 @@ fn lib_features(tcx: TyCtxt<'_>, LocalCrate: LocalCrate) -> LibFeatures {
     collector.lib_features
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     providers.lib_features = lib_features;
 }

compiler/rustc_passes/src/liveness.rs

@@ -178,7 +178,7 @@ fn check_liveness(tcx: TyCtxt<'_>, def_id: LocalDefId) {
     lsets.warn_about_unused_args(&body, entry_ln);
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers { check_liveness, ..*providers };
 }
 

compiler/rustc_passes/src/reachable.rs

@@ -500,6 +500,6 @@ fn reachable_set(tcx: TyCtxt<'_>, (): ()) -> LocalDefIdSet {
     reachable_context.reachable_symbols
 }
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers { reachable_set, ..*providers };
 }

compiler/rustc_passes/src/upvars.rs

@@ -9,7 +9,7 @@ use rustc_middle::query::Providers;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::Span;
 
-pub fn provide(providers: &mut Providers) {
+pub(crate) fn provide(providers: &mut Providers) {
     providers.upvars_mentioned = |tcx, def_id| {
         if !tcx.is_closure_like(def_id) {
             return None;

compiler/rustc_passes/src/weak_lang_items.rs

@@ -15,7 +15,11 @@ use crate::errors::{
 
 /// Checks the crate for usage of weak lang items, returning a vector of all the
 /// lang items required by this crate, but not defined yet.
-pub fn check_crate(tcx: TyCtxt<'_>, items: &mut lang_items::LanguageItems, krate: &ast::Crate) {
+pub(crate) fn check_crate(
+    tcx: TyCtxt<'_>,
+    items: &mut lang_items::LanguageItems,
+    krate: &ast::Crate,
+) {
     // These are never called by user code, they're generated by the compiler.
     // They will never implicitly be added to the `missing` array unless we do
     // so here.