special case numeric literals, and away we go!

tui/src/tui_border.rs

@@ -139,7 +139,7 @@ macro_rules! border {
         #[derive(Copy, Clone)]
         pub struct $T(pub Style);
         impl Content<TuiOut> for $T {
-            fn render (&self, to: &mut TuiOut) { self.draw(to); }
+            fn render (&self, to: &mut TuiOut) { let _ = self.draw(to); }
         }
     )+}
 }