one thing i love about rust's macros is that you can accomplish this without needing a separate file type or inventing syntax

   #[component]
   pub fn HomePage(user: Option<User>) -> Element {
      rsx! {
         Layout { 
            title: "Home",
            if let Some(u) = user {
               h1 { "Welcome back, {u.name}!" }
               a { href: "/users/{u.id}", "Your profile" }
            } else {
               h1 { "Welcome, guest!" }
               a { href: "/login", "Log in" }
            }
         }
      }
   }