{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
                let (result_expr_id, prev_binding_owner) =
            ast::Expr::ClosureExpr(e) => self.with_label_rib(RibKind::Closure, |this| {
                    this.initialize_binding_owner(syntax_ptr);