make some methods private

compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs

@@ -273,7 +273,8 @@ impl<'tcx> BorrowExplanation<'tcx> {
             _ => {}
         }
     }
-    pub(crate) fn add_lifetime_bound_suggestion_to_diagnostic(
+
+    fn add_lifetime_bound_suggestion_to_diagnostic(
         &self,
         err: &mut Diagnostic,
         category: &ConstraintCategory<'tcx>,

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -2180,7 +2180,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
         err.emit()
     }
 
-    pub(crate) fn add_missing_lifetime_specifiers_label(
+    fn add_missing_lifetime_specifiers_label(
         &mut self,
         err: &mut Diagnostic,
         lifetime_refs: Vec<MissingLifetime>,