{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":")"}]}
    ) -> Option<(HygieneId, &[(syntax::TextRange, Name)])> {
        node: InFile<&ast::FormatArgsExpr>,
        let src = node.map(AstPtr::new).map(AstPtr::upcast::<ast::Expr>);