bug#62720: 29.0.60; Not easy at all to upgrade :core packages like Eglot

[Eli Zaretskii]

> Cc: monnier@iro.umontreal.ca
> From: João Távora <joaotavora@gmail.com>
> Date: Fri, 07 Apr 2023 23:12:43 +0100
> 
> I've been meaning to report this for some time.  I really think this
> should be fixed in Emacs 29 before it ships.
> 
> src/emacs -Q # Emacs 29
> 
> M-x package-install RET eglot RET
> 
> Echoes "No match", even though eglot 1.14 is available from GNU ELPA.
> That's because Eglot is a :core ELPA package and it's already in Emacs
> 29, so package.el thinks there is nothing to install.

Is :core new in Emacs 29?  If not, then this problem is not new: it
existed earlier for every :core package in ELPA, it just didn't exist
for Eglot.