bug#45619: 28.0.50; pcase-let on MacOS doesn't work

[Michael Heerdegen]

jixiuf <jixiuf@qq.com> writes:

> (pcase-let ((`(,default-directory) '( "/tmp/")))
>     (call-interactively 'find-file))
>
> Expected behavior: Find file in "/tmp/"
> Observed behavior: Find file in "~"

AFAICT the issue here is that `pcase-let' always creates lexically
scoped bindings, even for special variables.  That can be surprising.

@Stefan, what can we do?  Document better?  Add compiler warnings?  Or
is it possible to "fix" this?

Regards,

Michael.