{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
        // This set is used later to generate the final format string. To keep builds reproducible,
    fn build_format(&self, input: &str, span: proc_macro2::Span) -> TokenStream {
        // the iteration order needs to be deterministic, hence why we use a `BTreeSet` here