{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"self.alloc_expr(Expr::Box"}]}
                    self.alloc_expr(Expr::Box { expr }, syntax_ptr)
                    let expr = self.collect_expr_opt(e.arg_list().and_then(|it| it.args().next()));
                } else {