Q re output arrays from functions ?

This could easily be done with a subroutine, with no problems - -

I have three variable length arrays here,

I want to add the contents of arrays A and B to get array C.

The zeroth element tells the number of items in the array.

The problem is - I cant get the compiler to work re the calling routine.

I tried to keep this as simple as possible - there must be a special trick to make it compile properly ?

Maybe the compiler is not meant to do this? However, in the CALLED routine it compiles with no problem.

any clues ? See attached source file.