[Oberon] Clarifying type compatibility in Oberon-07

[Артур Ефимов]

> His [Niklaus Wirth's] reply was:
> "Yes, I consider this type compatibility as an addition tothe language
definition. I think it makes sense, and it is easy to implement."
> I realize now that it is not really clear if he means that the
structural equivalence is a "non-standard" feature, or if the language
definition has changed, implying that every Oberon-07 compiler should
work this way. What do you think?

I would assume N. Wirth means he wants to update the language definition by
adding this rule.
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