[Oberon] Clarifying type compatibility in Oberon-07

[Andreas Pirklbauer]

> Oberon differentiates between the concept of structured types (“A”) vs basic (“B”) types.
>
> br
> Jörg

.... leaving the question open of what its defining property actually is.

It’s a matter of definition. The current status quo is:

- "basic types" imply structural equivalence
- “structured types” (arrays, records) imply name equivalence (except for open arrays).

-AP

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