Assume that instead of promising to pay Allie a certain amount for the repairs to the bus, Cipriani promised to pay Allie any future workers' compensation money received by Cipriani in exchange for the repairs to the bus. Would this assignment be legal

Firstly you should review the state laws, in view of the fact that some states will not permit settlement negotiations and many others require a judicial review of proposed settlement agreements.

Explanation:

As worker's compensation is an insurance providing wage replacement and medical benefits to employees injured in the course of employment, it might imply the judicial review if it is the case of the state, or if it is preferred for the employee but he/she cannot be obligated to accept this agreement, in the other hand it is mentioned the bus but it does not implies that the employee is injured by the accident, so it can be covered by the bus insurance.