Taking a cue from Ada, Swift provides an inout parameter mode. The language manual does not specify whether inout parameters are to be passed by reference or value-result. Write a program that...

Taking a cue from Ada, Swift provides an inout parameter mode. The language manual does not specify whether inout parameters are to be passed by reference or value-result. Write a program that determines the implementation used by your local Swift compiler. Fields of packed records (Example 8.8) cannot be passed by reference in Pascal. Likewise, when passing a subrange variable by reference, Pascal requires that all possible values of the corresponding formal parameter be valid for the subrange:

Using what you have learned about parameter-passing modes, explain these language restrictions.