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Hi David

On Wed, 23 Sep 2009 16:29:44 +0200 David Kastrup <dak@gnu.org> wrote:

> Alex Queiroz <asandroq@gmail.com> writes:
>>
>> On 9/23/09, Tony Finch <dot@dotat.at> wrote:
>>> On Wed, 23 Sep 2009, steve donovan wrote:
>>>  >
>>>  > This is a common notion. What can Scheme do that cannot be
>>>  > expressed
>>>  > in Lua?  (Note, this is an actual question)
>>>
>>>
>>> The two biggies are continuations and macros.
>>>
>>
>>      I would add that there are no statements, everything is an
>>      expression.
>
> (set! ... ) is not really an expression.  It has no value and only
> side effects.

According to R5RS, `set!' is an assignment expression
(http://schemers.org/Documents/Standards/R5RS/HTML/r5rs-Z-H-7.html#%_sec_4.1.6).

Best wishes.
Mario