{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"//"}]}
            // A `Ctor` doesn't have an identifier itself, but its parent
            Node::Pat(&Pat { kind: PatKind::Binding(_, _, ident, _), .. }) => Some(ident),
            // struct/variant does. Compare with `hir::Map::span`.