Question: There may be more to this

This is a follow-up question to my last-name evaluation question a few days ago.

Well, I thought I had got it, but look at this trivial example involving records:

r:=Record(p1=parm1,p2=parm2);

r:-p2;

         parm2

parm2:=0;

r:-p2;

        0

eval(r);

So while r:-p2 is being updated; an eval of r does not show it. I have reason to believe (from other much more complicated cases I have looked at) that in fact the parameters in a record do get updated and the printout in eval() is in error; but I do not have great confidence here... am I still missing something? (I realize that this is not directly a last-name evaluation question but this case seems to be related to the general issue of what is being evaluated when.).

Still using Maple 15.

Any more insight is appreciated,

M.D.