{"ast_node_type":"struct","tokens":[{"end":95,"kind":"keyword","start":0,"text":"//"}]}
            // `S<P0...Pn>` to `S<Q0...Qn>`. As an example, let's imagine a struct `Foo<T, U>`,
            // Here we are considering a case of converting
            // which acts like a pointer to `U`, but carries along some extra data of type `T`: