export class ExpressionPosition {
    constructor(
        public readonly start: number,
        public readonly end: number) {
        if (start === end) {
            throw new Error(`no length (start = end = ${start})`);
        }
        if (start > end) {
            throw Error(`start (${start}) after end (${end})`);
        }
        if (start < 0) {
            throw Error(`negative start position: ${start}`);
        }
    }
}
