bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

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bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

Terje Larsen

Since the commit 0e4dd67aae8b10032317a29a6bd99d2d4a64c897 there is a
regression for people using seq from MELPA.

The dependency was reversed so cl-subseq is using seq-subseq, but before
seq-subseq was using cl-subseq.

What ended up happening now is that Emacs is using the new builtin cl-subseq
from cl-extra. But using seq-subseq from MELPA which causes an infinite
loop as they depend on eachother.

What is the recommended way to solve this issue? I am not controlling
using seq from MELPA since I am using a package that pulls in seq from
MELPA as a dependency. For now I am considering to patch the seq in
MELPA.

Steps to reproduce:
- Use seq from MELPA
- Run (cl-subseq '(a b c) 0 0)


In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.12)
Windowing system distributor 'The X.Org Foundation', version 11.0.12005000
System Description: NixOS 20.03.git.5c9bf4fe8f4 (Markhor)

Recent messages:
Entering debugger...
Loaded Emacs in 3.590s
user-error: Beginning of history; no preceding item
Quit
Entering debugger...
Back to top level
Making completion list...
delete-backward-char: Text is read-only
scroll-up-command: End of buffer
delete-backward-char: Text is read-only

Configured using:
 'configure
 --prefix=/nix/store/cz5m77gf09rsy6c8xkd0i5bz6dpli60x-emacs-27.0.50
 --disable-build-details --with-modules --with-x-toolkit=gtk3 --with-xft
 CFLAGS=-DMAC_OS_X_VERSION_MAX_ALLOWED=101200'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY
LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD PDUMPER
GMP

Important settings:
  value of $EMACSLOADPATH: /nix/store/8hg4kp9h0l6z4izni0k2li3nqw0q3wpz-emacs-packages-deps/share/emacs/site-lisp:
  value of $LC_CTYPE: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  savehist-mode: t
  override-global-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
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Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
format-spec rfc822 mml mml-sec epa derived epg epg-config gnus-util
rmail rmail-loaddefs text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils help-fns
radix-tree cl-print debug backtrace find-func all-the-icons
all-the-icons-faces data-material data-weathericons data-octicons
data-fileicons data-faicons data-alltheicons memoize auto-tangle async
savehist cl-extra help-mode exec-path-from-shell cus-edit cus-start
cus-load wid-edit no-littering use-package use-package-ensure
use-package-delight use-package-diminish use-package-bind-key bind-key
use-package-core easy-mmode advice rx slime-autoloads edmacro kmacro
info package easymenu browse-url url-handlers url-parse auth-source
cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache json
subr-x map url-vars seq seq-25 byte-opt gv bytecomp byte-compile cconv
cl-loaddefs cl-lib tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame minibuffer cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 133046 97457)
 (symbols 48 13100 92)
 (strings 32 49743 11978)
 (string-bytes 1 1744290)
 (vectors 16 16935)
 (vector-slots 8 226284 83480)
 (floats 8 342 362)
 (intervals 56 2178 147)
 (buffers 1000 13))



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bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

Michael Heerdegen
Terje Larsen <[hidden email]> writes:

> Since the commit 0e4dd67aae8b10032317a29a6bd99d2d4a64c897 there is a
> regression for people using seq from MELPA.

I don't have an answer, but a question: do you really mean Melpa, or the
"seq" package provided in the Gnu Elpa repository?


Thanks,

Michael.



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bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

Terje Larsen
I meant the seq package provided by GNU ELPA repository. Guess I slipped on the keyboard there. My Emacs selects the seq25.el from ELPA. 

I have now patched it for myself locally. But I believe this can cause really big frustrations and confusion for people in the future. I guess one way to solve it would be to push a change that checks the Emacs version and provides different implementation, as 27 haven’t been released yet.

Thank you for catching my mistake.

On Mon, 4 Nov 2019 at 10:21, Michael Heerdegen <[hidden email]> wrote:
Terje Larsen <[hidden email]> writes:

> Since the commit 0e4dd67aae8b10032317a29a6bd99d2d4a64c897 there is a
> regression for people using seq from MELPA.

I don't have an answer, but a question: do you really mean Melpa, or the
"seq" package provided in the Gnu Elpa repository?


Thanks,

Michael.
--
// Terje Larsen
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bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

Michael Heerdegen
Hi Stefan,

is this issue on your radar?

Terje Larsen <[hidden email]> writes:

> I meant the seq package provided by GNU ELPA repository. Guess I
> slipped on the keyboard there. My Emacs selects the seq25.el from
> ELPA.

His original report:

> Since the commit 0e4dd67aae8b10032317a29a6bd99d2d4a64c897 there is a
> regression for people using seq from MELPA.

> The dependency was reversed so cl-subseq is using seq-subseq, but before
> seq-subseq was using cl-subseq.

> What ended up happening now is that Emacs is using the new builtin cl-subseq
> from cl-extra. But using seq-subseq from MELPA which causes an infinite
> loop as they depend on eachother.

> What is the recommended way to solve this issue? I am not controlling
> using seq from MELPA since I am using a package that pulls in seq from
> MELPA as a dependency. For now I am considering to patch the seq in
> MELPA.


TIA,

Michael.



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bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

Stefan Monnier
>> What ended up happening now is that Emacs is using the new builtin cl-subseq
>> from cl-extra.

This new cl-subseq only exists in Emacs's `master`, right?
So they're running Emacs `master`.

>> But using seq-subseq from MELPA which causes an infinite
>> loop as they depend on eachother.

Why would they use "seq-subseq from MELPA" when they have the latest
seq.el built into their Emacs `master`?

>> What is the recommended way to solve this issue? I am not controlling
>> using seq from MELPA since I am using a package that pulls in seq from
>> MELPA as a dependency. For now I am considering to patch the seq in
>> MELPA.

Could we have some more data, such as which package (name and version)
pulls which version of `seq` (and how does it say "from MELPA")?


        Stefan "¡¿why on earth would you put `seq` on MELPA?!"




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bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

Terje Larsen
Stefan Monnier <[hidden email]> writes:

>>> What ended up happening now is that Emacs is using the new builtin cl-subseq
>>> from cl-extra.
>
> This new cl-subseq only exists in Emacs's `master`, right?
> So they're running Emacs `master`.
>

Yes, as mentioned, this is Emacs from `master`, since commit `0e4dd67aae8b10032317a29a6bd99d2d4a64c897`.

>>> But using seq-subseq from MELPA which causes an infinite
>>> loop as they depend on eachother.
>
> Why would they use "seq-subseq from MELPA" when they have the latest
> seq.el built into their Emacs `master`?
>

I am sorry to have written MELPA, but I meant ELPA. I think you can
reproduce this by installing `seq` from ELPA via package-install, which
Emacs clearly marks as an older version, so that would be questionable.

But is it that unlikely that you somehow would have the `seq` from ELPA
on your `load-path`?

>>> What is the recommended way to solve this issue? I am not controlling
>>> using seq from MELPA since I am using a package that pulls in seq from
>>> MELPA as a dependency. For now I am considering to patch the seq in
>>> MELPA.
>
> Could we have some more data, such as which package (name and version)
> pulls which version of `seq` (and how does it say "from MELPA")?
>

In ELPA there are not that many packages that depend on seq, but there
is for example `beacon` which depends on `(seq "2.14")`. In MELPA there
is a lot, for example `org-drill` which also depends on `(seq "2.14")`.

However I think `seq` won't be pulled from ELPA for these since the
dependency is already satisfied by the built-in version.

I am using NixOS and I think this issue comes from nix and how it
resolves packages. Nix will resolve Emacs package dependencies on a
system level and make sure all of them are added to your `load-path`
when launching Emacs. The unfortunate thing is that if a package depends
on `seq`, it pulls the one from ELPA since it doesn't know about the
built-in package in Emacs.

I will raise this issue on the nixpkgs instead, as it is less likely
that non-nix users will have the ELPA `seq` on their `load-path`.

>
>         Stefan "¡¿why on earth would you put `seq` on MELPA?!"

No-one put seq on MELPA, it was ELPA all-along, once again sorry for
that mistake.


Thank you for your reply and if you don't think anything needs to be
done on Emacs/ELPA side, feel free to close this issue.



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bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

Stefan Monnier
>> Why would they use "seq-subseq from MELPA" when they have the latest
>> seq.el built into their Emacs `master`?
> I am sorry to have written MELPA, but I meant ELPA.

[ ELPA is the whole infrastructure/protocol.  I'll assume you meant the
  GNU ELPA repository.  ]

Ah, much better.  We definitely want this case to work right.

> But is it that unlikely that you somehow would have the `seq` from ELPA
> on your `load-path`?

That would be a bug, yes.
How do you end up with ELPA's `seq` in your `load-path`: package.el
should not activate the `seq` package (because it should consider the
built-in one "at least as good").

>> Could we have some more data, such as which package (name and version)
>> pulls which version of `seq` (and how does it say "from MELPA")?
> In ELPA there are not that many packages that depend on seq, but there
> is for example `beacon` which depends on `(seq "2.14")`. In MELPA there
> is a lot, for example `org-drill` which also depends on `(seq "2.14")`.

Right.  I was worried about dependencies on MELPA's `seq` (assuming it
used a different versioning scheme, which would thus indeed wreak havoc
with package.el's attempt to compare the `seq` package's version with
the built-in one).

> I am using NixOS and I think this issue comes from nix and how it
> resolves packages. Nix will resolve Emacs package dependencies on a
> system level and make sure all of them are added to your `load-path`
> when launching Emacs. The unfortunate thing is that if a package depends
> on `seq`, it pulls the one from ELPA since it doesn't know about the
> built-in package in Emacs.

Sounds like a bug in the NixOS handling of Emacs's packages, then: they
should presumably be added to `package-directory-list` or
`package-user-dir` but not directly to `load-path`.

After all, adding them to `load-path` also breaks `package-load-list`
(since `package-load-list` lets you specify packages which shouldn't be
activated (aka put into your `load-path`) even though they're installed).

> Thank you for your reply and if you don't think anything needs to be
> done on Emacs/ELPA side, feel free to close this issue.

It does look like the problem is on NixOS's side, indeed.


        Stefan




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bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

John Wiegley-6
>>>>> "SM" == Stefan Monnier <[hidden email]> writes:

SM> It does look like the problem is on NixOS's side, indeed.

I can confirm that stubbing this in Nix based on the Emacs version fixes the
problem for me:

    seq = if super.emacs.version == "27.0"
      then mkDerivation rec {
        name = "seq-stub";
        version = "stub";
        src = ./.;
        phases = [ "installPhase" ];
        installPhase = ''
          mkdir $out
          touch $out/.empty
        '';
      }
      else super.seq;

We'll have to ask the maintainers of the Emacs portion of nixpkgs to do
something similar on their side.

--
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2



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bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA

Stefan Monnier
> SM> It does look like the problem is on NixOS's side, indeed.
> I can confirm that stubbing this in Nix based on the Emacs version fixes the
> problem for me:
>
>     seq = if super.emacs.version == "27.0"
>       then mkDerivation rec {
>         name = "seq-stub";
>         version = "stub";
>         src = ./.;
>         phases = [ "installPhase" ];
>         installPhase = ''
>           mkdir $out
>           touch $out/.empty
>         '';
>       }
>       else super.seq;
>
> We'll have to ask the maintainers of the Emacs portion of nixpkgs to do
> something similar on their side.

I don't think they need to do something special for Emacs≥27, instead
they should install those packages without touching load-path but
instead making sure package.el sees those installed packages so *it* can
activate those packages properly (adding them to `load-path` and loading
their <pkg>-autoloads.el files, all while obeying `package-load-list`).

I'd be surprised if their system doesn't introduce bugs in
Emacs<27 already.


        Stefan