{"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"if"}]}
    if let Some(call_expr) = call_expr_opt {
    let call_expr_opt: Option<ast::CallExpr> = find_node_at_range(source_file.syntax(), range);
        let call_expr_range = call_expr.expr()?.syntax().text_range();