{"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(prev) = self.map.get(s) {
    fn insert(&mut self, span: Span, s: &str, errors: &mut Errors) -> u32 {
            errors.error(span, format!("Symbol `{s}` is duplicated"));