binary slots (§ 3.2.3) explanation and how to add annotations/grouping (§ 3.2.5)

[notebook]

Hello,

I'm currently going through the Handbook slowly to get myself ready to 
make some videos for self-starters. The question about local vars last 
time was also in this regard.
Now I'm I'm stuck around chapter 3.2. I would (as always) really 
appreciate your help!

1. binary slots (§ 3.2.3)

I'm having trouble getting the example to work. This is probably due to 
the lack of my understanding.
Example:

(  |
       +  =  (  |  :arg  |  (clone  x:  x  +  arg  x)  y:  y  +  arg  y  ).
|  ) This will create a Slot object with a slot "+ arg (clone x: ..." I 
then create another slot object with a parent*-slot the the one I just 
created a parent2*-slot to traits clonable x-slot y-slot How would I 
call call + now? "self + self"? 2. Annotations / Grouping (§ 3.2.5) The 
handbook says, that the below creates a new slot containing a group 
"accessing" ( |
       { ’Category: accessing’
             getOne = (...).
             getAnother = (...).
       }
| )

That's working so far. But it creates a *new* object. What would I do, if I would like to *add* a group / annotation to an already existing object?


Best regards
Chris


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