How does one require the seq library after installing an updated version of it with package.el?

How does one require the seq library after installing an updated version of it with package.el?

[Clément Pit-Claudel]

Hi there,

Because package.el requires `seq', seq is loaded very early after starting Emacs — so early, in fact, that when package-initialize adds elpa/ directories to the load-path, seq is already loaded.

As a result, even if a newer version of seq is installed, it is never loaded, because the built-in seq library is already loaded.

I got bitten by this while developing a package that uses seq-sort-by, which isn't available in Emacs 25's built-in seq.  I added a dependency on seq 2.14, which does contain seq-sort-by, but that doesn't help: package.el does install the dependency, but it is never loaded.

Is this a bug, or am I doing something wrong?

Thanks!
Clément.

Re: How does one require the seq library after installing an updated version of it with package.el?

[Stefan Monnier]

> Is this a bug, or am I doing something wrong?

It's a bug.


        Stefan

Re: How does one require the seq library after installing an updated version of it with package.el?

[Clément Pit-Claudel]

On 29/04/2020 12.16, Stefan Monnier wrote:
>> Is this a bug, or am I doing something wrong?
> 
> It's a bug.

Thanks, reported as #40971.

Re: How does one require the seq library after installing an updated version of it with package.el?

[Richard Stallman]

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

  > Because package.el requires `seq', seq is loaded very early after starting Emacs

For libraries we expect many users to load, such as package.el, it
might be better to avoid depending on seq.el.

We no longer need to try to keep Emacs under Eight Megabytes,
but we may as well avoid things that cause it to grow
when they are easy to avoid.


-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)