syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"ty::Tuple(tys)"}]}
source_snippet:             ty::Tuple(tys) if tys.is_empty() => "".to_owned(),
context_before:         let underscored_args = match tupled_args.kind() {
context_after:             ty::Tuple(tys) => std::iter::repeat("_, ").take(tys.len() - 1).chain(["_"]).collect(),