{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
        let (range, description) = if let Some((r, _, c)) = self.peek() {
    fn missing_closing_brace(&mut self, arg: &Argument<'_>) {
            (r.start..r.start, format!("expected `}}`, found `{}`", c.escape_debug()))