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Re: Which Elisp types are mutable?


From: Philipp
Subject: Re: Which Elisp types are mutable?
Date: Mon, 5 Jul 2021 20:40:01 +0200


> Am 05.06.2021 um 16:25 schrieb Stefan Monnier via Users list for the GNU 
> Emacs text editor <help-gnu-emacs@gnu.org>:
> 
>> "You must not mutate them" is the definition of immutable.
> 
> Not necessarily: where I come from "immutable" means that the object
> cannot and will not be mutated.
> 

Then there are no immutable objects, because all objects are stored in mutable 
memory.  It's just that mutating some of them is a bit harder than others.  So 
this definition of "immutable" isn't very useful.


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