Re: Real-life examples of lexical binding in Emacs Lisp

["Andreas Röhler" <andreas.roehler@easy-emacs.de>]

Am 17.06.2015 um 02:06 schrieb Emanuel Berg:
> Jim Diamond <Jim.Diamond@deletethis.AcadiaU.ca>
> writes:
>
>> Really? Are there well-agreed-upon studies showing
>> those things? Or are they your opinion?
>>
>> It strikes me that lexical scoping is easier to
>> implement for compiled languages (that is an "off
>> the cuff" comment from someone (me) with basic
>> knowledge of compiler construction). But if lexical
>> scoping is "more natural", is that because more
>> people were "brought up" with lexically-scoped
>> languages than dynamically-scoped languages?
> This discussion is much easier to have if that
> confusing terminology is dropped for a second and we
> instead study the simple example of a `let' form:
>
>      (let ((scratch-buffer "*scratch*"))
>        (when (bufferp scratch-buffer)
>          (kill-buffer scratch-buffer) ))
>
> Here we have one piece of data which is used twice, so
> that data is named and when it is used it is
> indirectly refered to.
>
> In this example, what is natural to me? Answer:
> I don't expect `let' to affect any other code than the
> code in the `let' itself! And this is "lexical
> scoping".

Nonetheless, that's the way Emacs acted all the time, while called 
"dynamically" scoped.

Now with "lexical" we have instead an injection, if a function with same 
arguments' symbol is called inside let.

Seems neither "lexical" nor "dynamic" express the real thing.