Honestly, I think using `add-to-list' here makes no sense.
Since we have the variable as a symbol and we're macro-expanding, we can
just use `(unless (member ,element ,var) (setq ,var (cons ,element ,var)))
That'll be a lot more efficient than going through a function call to
add-to-list, using an aux-var accessed via symbol-value and set and checking
`append' arg etc...
Maybe you're right, but note that it can't actually be `member' in
this case, not by default, since the default comparison function for
pushnew is `eql'.
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