Symbolic reference question

[DrD]

Thank you, Cyrille.

Within the program I had used c:={'a','b'}, and that was how I was able to get to the point where c={a,b}.

However, I haven't been successful with: EXECON("&1:=&2",c,d);

Can you think of a syntax that works? I've tried several ways, with no success. This seems like such a basic operation. It's surprising that symbolic references, don't seem to be programmable, even though directly using the contents of the symbolic reference works.

Summary:
[CAS]
purge({a,b});
c:={'a','b'};
d:={100.5,102.5};

c:=d; // ==> c gets set to the contents of d, (as expected).
EXECON("&1:=&2",c,d); // Error message ...

{a,b}:={100.5,102.5}; // a=100.5; b=102.5 (Works. How to get to this result, using the symbolic reference?)