import { IParseTree } from './ParseTree';
import { Position } from './Position';
import { IParsingExpression } from './ParsingExpression';
import { IParsingEnv } from './IParsingEnv';
export declare class Rule {
    symbol: string;
    rhs: IParsingExpression;
    isWater: boolean;
    constructor(symbol: string, rhs: IParsingExpression, isWater?: boolean);
    parse(env: IParsingEnv, pos: Position): [IParseTree, Position] | null;
    parseWithoutMemo(env: IParsingEnv, pos: Position): [IParseTree, Position] | null;
}
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