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([2601:184:4180:66e7:9d33:2bf5:e2d3:3d95]) by smtp.googlemail.com with ESMTPSA id n13sm16701038qtf.15.2020.04.29.08.51.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Apr 2020 08:51:34 -0700 (PDT) Content-Language: en-GB Received-SPF: pass client-ip=2607:f8b0:4864:20::f34; envelope-from=cpitclaudel@gmail.com; helo=mail-qv1-xf34.google.com X-detected-operating-system: by eggs.gnu.org: Error: [-] PROGRAM ABORT : Malformed IPv6 address (bad octet value). Location : parse_addr6(), p0f-client.c:67 X-Received-From: 2607:f8b0:4864:20::f34 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:248158 Archived-At: 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.