refactor

src/ui/mod.rs

@@ -113,8 +113,10 @@ impl UIWidget for PreEscaped<String> {
 
 /// Trait for an element which can add new `attrs`
 pub trait AttrExtendable {
+    #[must_use]
     fn add_attr(self, key: &str, val: &str) -> Self;
 
     /// Set the `id` attribute of an element.
+    #[must_use]
     fn id(self, id: &str) -> Self;
 }