comments

src/layout/id.rs

@@ -67,6 +67,7 @@ impl<W> WidgetId<W> {
     }
 
     pub(super) fn cast_type<W2>(self) -> WidgetId<W2> {
+        // safety: self is repr(C) and generic only used for phantom data
         unsafe { std::mem::transmute(self) }
     }