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

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From: "John Wiegley" <johnw <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Michael Heerdegen <michael_heerdegen <at> web.de>, 37976 <at> debbugs.gnu.org, Terje Larsen <terlar <at> gmail.com>
Subject: bug#37976: 27.0.50; Dependency reversal of seq-subseq and cl-subseq causes regression when using seq from ELPA
Date: Fri, 15 Nov 2019 11:20:50 -0800

>>>>> "SM" == Stefan Monnier <monnier <at> iro.umontreal.ca> 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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