export declare function toggleSet<A>(s: Set<A>, a: A): void;
export declare function setMinus<A>(a: Set<A>, b: Set<A>): Set<A>;
export declare function setAdd<A>(a: Set<A>, b: Set<A>): Set<A>;
export declare function setMinusInplace<A>(to: Set<A>, from: Set<A>): void;
export declare function setAddInplace<A>(to: Set<A>, from: Set<A>): void;