{"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"///"}]}
    /// and `fluent_attr_identifier`.
    /// Adds a subdiagnostic by generating a `diag.span_$kind` call with the current slug
    fn add_subdiagnostic(&self, kind: &Ident, fluent_attr_identifier: Path) -> TokenStream {