[Oberon] Porting S3 / V4 Oberon

[Andreas Pirklbauer]

    > A small LOOP with a single EXIT is relatively painless to fix. It is when
    > you get nested LOOPs spanning many lines with multiple EXITs (and possibly
    > RETURNs) in each that life becomes interesting. 
    >
    > This is where evolution kicks in. The lifetime of such code is limited by
    > the number of people who are able and prepared to maintain it. 

One possible approach could be:
 
Add the small number of “Original Oberon-2” features such as LOOP, EXIT
and RETURN to the compiler just to *initially* speed up the porting effort of
V4. But *eventually* eliminate those constructs *on* the then-ported system.

The advantage would be that one would not need to also deal with porting
complex, nested LOOP statements initially, thereby reducing risk of errors..

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