Re: `apply-partially` and hash tables

[Stefan Monnier]

Rudolf Schlatte [2024-10-20 21:12:33] wrote:
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>>> My question is the same, though: can it be relied upon?
>>
>> It's fundamental to the notion of what is a *value* (as in "call by
>> value"), so yes, very much so.
>
> The usual caveat for lists applies: prepending values to the front or
> otherwise mutating the list will not work as expected in general, since
> what you're holding is just a cons cell.  (This is an instance of the
> "delete bug" where you have to write `(setq x (delete 'foo x))' instead
> of just `(delete 'foo x)'.)

AFAICT this behavior is a direct result of that same fundamental
difference between a value and the thing it refers to, so not a caveat
at all.


        Stefan