Re: ELPA and built-in packages

[Phil Sainty]

On 2021-11-01 07:55, Stefan Monnier wrote:
> Reality will sometimes disagree, because it depends if `package.el`
> is truly informed about the built-in package.

What is it about the built-in package that "informs" package.el?

I just did a test with so-long.el and got slightly odd results.

1. I ran Emacs 27.2 (which includes so-long 1.0) with a fresh profile.
2. I then installed v1.1 from 
https://elpa.gnu.org/packages/so-long-1.1.tar.lz
3. I then quit and ran Emacs 28 (which includes so-long 1.1.2).
4. M-x package-refresh-contents
5. M-x package-list-packages
6. M-x occur RET so-long

Result:

3 matches for "so-long" in buffer: *Packages*
    310:  so-long         1.1.2         available         gnu
    388:  so-long         1.1           installed
    444:  so-long         1.0           built-in

The actual so-long functionality is good (the built-in version 1.1.2 is
used in practice, as desired), but that listing is definitely confused.


-Phil