{"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"///"}]}
    /// should appear at the enclosing `PolyTraitRef`.
    /// The extra lifetimes that appear from the parenthesized `Fn`-trait desugaring
    fn extra_lifetime_params(&mut self, id: NodeId) -> Vec<(Ident, NodeId, LifetimeRes)> {