Reduce exposure of some things.

compiler/rustc_ast_lowering/src/index.rs

@@ -10,7 +10,7 @@ use rustc_middle::ty::TyCtxt;
 use rustc_span::{Span, DUMMY_SP};
 
 /// A visitor that walks over the HIR and collects `Node`s into a HIR map.
-pub(super) struct NodeCollector<'a, 'hir> {
+struct NodeCollector<'a, 'hir> {
     tcx: TyCtxt<'hir>,
 
     bodies: &'a SortedMap<ItemLocalId, &'hir Body<'hir>>,

compiler/rustc_ast_lowering/src/lifetime_collector.rs

@@ -108,7 +108,7 @@ impl<'ast> Visitor<'ast> for LifetimeCollectVisitor<'ast> {
     }
 }
 
-pub fn lifetimes_in_bounds(
+pub(crate) fn lifetimes_in_bounds(
     resolver: &ResolverAstLowering,
     bounds: &GenericBounds,
 ) -> Vec<Lifetime> {

compiler/rustc_ast_lowering/src/pat.rs

@@ -18,7 +18,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         self.arena.alloc(self.lower_pat_mut(pattern))
     }
 
-    pub(crate) fn lower_pat_mut(&mut self, mut pattern: &Pat) -> hir::Pat<'hir> {
+    fn lower_pat_mut(&mut self, mut pattern: &Pat) -> hir::Pat<'hir> {
         ensure_sufficient_stack(|| {
             // loop here to avoid recursion
             let node = loop {