Remove unnecessary sigils around Symbol::as_str() calls.

compiler/rustc_resolve/src/lib.rs

@@ -3482,7 +3482,7 @@ fn names_to_string(names: &[Symbol]) -> String {
         if Ident::with_dummy_span(*name).is_raw_guess() {
             result.push_str("r#");
         }
-        result.push_str(&name.as_str());
+        result.push_str(name.as_str());
     }
     result
 }