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Re: Plist-put changes literal argument
From: |
Yuan Fu |
Subject: |
Re: Plist-put changes literal argument |
Date: |
Wed, 2 Sep 2020 19:59:38 -0400 |
> On Sep 2, 2020, at 7:55 PM, Yuan Fu <casouri@gmail.com> wrote:
>
> I found plist-put changes the literal argument I pass to a function:
>
> (defun test ()
> (test-2 '(:a b)))
>
> (defun test-2 (form)
> (print form)
> (plist-put form :a 'c)
> nil)
>
> (progn (test) (test))
>
> (:a b)
>
> (:a c)
> nil
>
> I thought Elisp is pass-by-copy? Is this expected?
>
> P.S., (setf (alist-get )) does the same, I guess this IS expected?
>
> Yuan
I also tried setcar, same result. So Elisp doesn’t copy arguments?
Yuan