{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"//"}]}
    // this is going to expand to something like:
    //    `for<'a, 'b> <T as Trait<'a>>::x(): Other<'b>`
    //    `for<'a, 'b, 'r> <T as Trait<'a>>::x::<'r, T>::{opaque#0}: Other<'b>`.