[Oberon] Viewer marking.

[peter at easthope.ca]

From:	Andreas Pirklbauer <andreas_pirklbauer at yahoo.com>
Date:	Tue, 6 Mar 2018 20:59:24 +0100
> Perhaps the reason why Sort traps is that Oberon.MarkedViewer
> returns the filler viewer, whose fields Viewers.FillerViewer.dsc
> and Viewers.FillerViewer.next are both always set to NIL.


Thanks.  Will think about that possibility and try to make the 
test module behave well before adding more to Sort.

                     ... Lyall E.

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