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From: Philipp Stephani
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Subject: Re: Plist-put changes literal argument
Date: Sat, 5 Sep 2020 17:55:20 +0200
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Am Do., 3. Sept. 2020 um 02:18 Uhr schrieb Yuan Fu :
>
> >
> > I also tried setcar, same result. So Elisp doesn=E2=80=99t copy argumen=
ts?
> >
> > Yuan
>
>
> Ok, think more of it, it would be weird to make a full copy of cons (and =
other non-primitive values) on function call. I wonder how do other languag=
es deal with this, because I never run into problems like this (except for =
in Python, with its default argument values).
Most other languages don't have literals of mutable types; or, if they
do, they create a new object for each evaluation of the literal
expression.