The following code is a partial implementation of a vending machine, which takes special VendingTokens and returns Beverage objects.

class VendingToken {}

class VendingMachine {
  public Beverage processSale(VendingToken token) { // Location (A)
    // Dispense beverage (code not shown)
  }
}

class User {
  public buyBeverage(VendingMachine machine, VendingToken token) {  // Location (B)
    machine.processSale(token);
  }
}

The declaration of processSale (Location A) is missing ownership annotations. Please re-write it correctly.