{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"Substitution::Name(n,"}]}
                Substitution::Name(n, _) => Ok(format!("{{{}}}", n)),
                Substitution::Ordinal(n, _) => Ok(format!("{{{}}}", n)),
                Substitution::Escape(_) => Err(None),