>> The first solution binds the <varN> variables lexically rather than
>> dynamically. That means that if those <varN> appear lexically inside
>> the <form> things will work correctly, but if <form> calls a function
>> which then refers to <varN> this reference will fail.
> Thank you for the clarification. The code in bbdb-anniv binds the
> variables lexcially via let which also contains the call of eval.
> So this is fine.
Not sure I understand. You seem to describe something like
(let ((x1 v1)) ... (eval exp) ...)
in which case the evaluation of `exp' will not have access to `x1'.
What I suggested was
(eval exp `((x1 . ,v1)))
in which case the value of `exp' can contain references to `x1'.
But it's still different from a dynamic-binding of `x1', because
(let ((exp '(+ x1 4)))
(eval exp `((x1 . 5))))
will correctly return 9, but
(defun my-f (y) (+ x1 y))
(let ((exp '(my-f 4)))
(eval exp `((x1 . 5))))
will signal en error because `x1' is not visible to `my-f' (it's only
visible lexically within `exp').
In many cases, this is perfectly acceptable, in which case it's the
solution I recommend.
Stefan
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