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([2601:184:4180:66e7:ac91:cb89:998d:8033]) by smtp.gmail.com with ESMTPSA id x185sm5942306qke.49.2018.03.12.16.29.37 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Mar 2018 16:29:37 -0700 (PDT) In-Reply-To: Content-Language: en-GB X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400d:c09::22a X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:223669 Archived-At: On 2018-03-12 18:40, Stefan Monnier wrote: >> Is there any way for package to know how many mandatory arguments a >> function has, to be able to branch out for compatibility reasons? > > The way I recommend is: > > (condition-case nil > (call1 ...) > (wrong-number-of-arguments > (call2 ...))) Out of (mostly theoretical) curiosity: is there a way to restrict that condition-case to that specific function call? (rather than catching all incorrect calls in that call tree)