import { Exp, ExpMeta } from "../../exp";
import { Core } from "../../core";
import { Ctx } from "../../ctx";
import { Value } from "../../value";
import * as Exps from "../../exps";
export declare class Ext extends Exp {
    meta: ExpMeta;
    parent: Exp;
    rest_t: Exps.Cls;
    constructor(parent: Exp, rest_t: Exps.Cls, meta: ExpMeta);
    free_names(bound_names: Set<string>): Set<string>;
    subst(name: string, exp: Exp): Exp;
    repr(): string;
    infer(ctx: Ctx): {
        t: Value;
        core: Core;
    };
    private get_parent_value;
}