GNU bug report logs - #5371
Priority of different kind of local variable bindings

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Lennart Borgman <lennart.borgman <at> gmail.com>
Cc: 5371 <at> debbugs.gnu.org
Subject: bug#5371: Priority of different kind of local variable bindings
Date: Wed, 13 Jan 2010 13:45:47 -0500

>> What do you mean by "priority of different kind of local variables"?
> I just meant which value is active at a certain point.

It's not based on priorities.

> (with-temp-buffer
>   (set (make-local-variable 'temp-var) "buffer-2")
>   (temp-var-display "cc")

>   (let ((temp-var "let"))
>     (temp-var-display "dd")

>     (kill-local-variable 'temp-var)
>     (temp-var-display "ff"))

The `let' binding affects the currently "active" slot, so in this case
it affects the buffer-local slot.  So after kill-local-variable, this
binding is lost.

Note that mixing let-binding and buffer-local bindings is generally
discouraged.  The only known reasonably sane semantics for such a mix is
when the variable is always buffer-local.  If you mix `let' with
make-local-variable and kill-local-variable you're really asking
for trouble.


        Stefan

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