{"ast_node_type":"other","tokens":[{"end":23,"kind":"keyword","start":0,"text":"//"}]}
        // For example:
        // This checks whether there is a subtyping relation between the predicates in either direction.
        // - casting between `dyn for<'a> Trait<fn(&'a u8)>` and `dyn Trait<fn(&'static u8)>` is OK