rustdoc: Record aliases as Symbols

src/librustdoc/html/render/mod.rs

@@ -103,7 +103,7 @@ crate struct IndexItem {
     crate parent: Option<DefId>,
     crate parent_idx: Option<usize>,
     crate search_type: Option<IndexItemFunctionType>,
-    crate aliases: Box<[String]>,
+    crate aliases: Box<[Symbol]>,
 }
 
 /// A type used for the search index.