{"ast_node_type":"other","tokens":[{"end":128,"kind":"keyword","start":0,"text":"arg.format.fill_span.clone().map(|sp|"}]}
                arg.format.fill_span.clone().map(|sp| ("this is not interpreted as a formatting closing brace".to_owned(), sp)),
                Some("the character `}` is interpreted as a fill character because of the `:` that precedes it".to_owned()),
            )