import type { Result } from './interface.js';
import { error_tag } from '../../Constant/mod.js';
export interface Err<E> extends Result<never, E> {
    readonly _tag: typeof error_tag;
    readonly value: E;
}
/** ## Err(E) : 表示错误并包含一个错误值 */
export declare function Err<E>(value: E): Result<never, E>;
export declare function is_err<E = unknown>(value: unknown): value is Err<E>;
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