initialize(segment) {
		const outdatedReadVariables = new Set();
		const freshReadVariables = new Set();

		for (const prevSegment of segment.prevSegments) {
			const info = this.info.get(prevSegment);

			if (info) {
				info.outdatedReadVariables.forEach(
					Set.prototype.add,
					outdatedReadVariables,
				);
				info.freshReadVariables.forEach(
					Set.prototype.add,
					freshReadVariables,
				);
			}
		}

		this.info.set(segment, { outdatedReadVariables, freshReadVariables });
	}
Initialize the segment information.
@param {PathSegment} segment The segment to initialize.
@returns {void}