{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"//"}]}
                        // If this is a unit or tuple-like struct, register the constructor.
                    | ItemKind::Union(_, _, ref struct_def) => {
                        if let Some((ctor_kind, ctor_node_id)) = CtorKind::from_ast(struct_def) {