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bug#9469: buffer-local variables seem to remember previous values
From: |
Stefan Monnier |
Subject: |
bug#9469: buffer-local variables seem to remember previous values |
Date: |
Tue, 13 Sep 2011 08:54:58 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
> "The special form quote returns its single argument, as written,
> without evaluating it. This provides a way to include constant symbols
> and lists"
> Isn't the first sentence misleading? It does not *always* return a
> single argument as written. It does the first time, and memoizes
> subsequently. Where is the mention of that?
There is no memoization: the quote does not *construct* the object, it
just returns it.
The problem is similar/identical to what happens with immediate strings in C:
char *foo (void)
{
char *res = "toto\n";
res[1]++;
return res;
}
[ modern C tries to fix this problem by the use of "const char*". ]
> Again, pedantically speaking, the information is there. It's just not
> clear enough to prevent other people falling into this trap in the
> future.
I'd be happy to try and make it more clear to people who aren't familiar
with it (after all, that's the main target audience here), but I'm not
sure how.
Do you have some suggestion about what text to use to make it clear to you?
Stefan
- bug#9469: buffer-local variables seem to remember previous values, (continued)
- bug#9469: buffer-local variables seem to remember previous values, Le Wang, 2011/09/11
- bug#9469: buffer-local variables seem to remember previous values, Lars Magne Ingebrigtsen, 2011/09/11
- bug#9469: buffer-local variables seem to remember previous values, Le Wang, 2011/09/11
- bug#9469: buffer-local variables seem to remember previous values, Lars Magne Ingebrigtsen, 2011/09/11
- bug#9469: buffer-local variables seem to remember previous values, Le Wang, 2011/09/12
- bug#9469: buffer-local variables seem to remember previous values, Andreas Schwab, 2011/09/12
- bug#9469: buffer-local variables seem to remember previous values, Le Wang, 2011/09/12
- bug#9469: buffer-local variables seem to remember previous values, Andreas Schwab, 2011/09/12
- bug#9469: buffer-local variables seem to remember previous values, Drew Adams, 2011/09/12
- bug#9469: buffer-local variables seem to remember previous values, Le Wang, 2011/09/12
- bug#9469: buffer-local variables seem to remember previous values,
Stefan Monnier <=
- bug#9469: buffer-local variables seem to remember previous values, Le Wang, 2011/09/13
- bug#9469: buffer-local variables seem to remember previous values, Helmut Eller, 2011/09/13
- bug#9469: buffer-local variables seem to remember previous values, Johan Bockgård, 2011/09/13
- bug#9469: buffer-local variables seem to remember previous values, Drew Adams, 2011/09/13
- bug#9469: buffer-local variables seem to remember previous values, Helmut Eller, 2011/09/13
- bug#9469: buffer-local variables seem to remember previous values, Le Wang, 2011/09/15
- bug#9469: buffer-local variables seem to remember previous values, Helmut Eller, 2011/09/11
- bug#9469: buffer-local variables seem to remember previous values, Andreas Schwab, 2011/09/11