Switch todo!() to unreachable!/unimplemented! where it matters

packages/core/src/events.rs

@@ -150,8 +150,8 @@ impl<T: std::fmt::Debug> std::fmt::Debug for Event<T> {
 /// }
 ///
 /// #[derive(Props)]
-/// struct MyProps<'a> {
-///     onclick: EventHandler<'a, MouseEvent>,
+/// struct MyProps {
+///     onclick: EventHandler<MouseEvent>,
 /// }
 ///
 /// fn MyComponent(cx: MyProps) -> Element {

packages/core/src/properties.rs

@@ -72,7 +72,7 @@ where
 {
     type Builder = P;
     fn builder() -> Self::Builder {
-        todo!()
+        unreachable!("Root props technically are never built")
     }
     fn memoize(&mut self, _other: &Self) -> bool {
         true