[Oberon] Clarifying type compatibility in Oberon-07

[Andreas Pirklbauer]

> 2. If this is implemented by adjusting the stack pointer,
> then you do have a point: i.e. the question is how the
> stack pointer  gets readjusted in the "right way” at
> the end of the procedure, given that the amount by how
> much it needs to adjusted is not known at compile time?
>

I forgot to add that this approach of course invalidates
the stack pointer (SP) itself. So one would need to find
a different way in fact.

Ask Chris..

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