From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Should records be able to mimic primitive types? Date: Tue, 04 Apr 2017 21:09:41 -0400 Message-ID: References: <8777899d-ca8e-212c-b8bf-2f8da4c54836@cs.ucla.edu> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1491354656 31630 195.159.176.226 (5 Apr 2017 01:10:56 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 5 Apr 2017 01:10:56 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Apr 05 03:10:52 2017 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cvZT8-0006VH-TZ for ged-emacs-devel@m.gmane.org; Wed, 05 Apr 2017 03:10:43 +0200 Original-Received: from localhost ([::1]:38281 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cvZTB-0002qj-Qj for ged-emacs-devel@m.gmane.org; Tue, 04 Apr 2017 21:10:45 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55724) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cvZSY-0002p1-Jp for emacs-devel@gnu.org; Tue, 04 Apr 2017 21:10:07 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cvZST-0003eJ-MN for emacs-devel@gnu.org; Tue, 04 Apr 2017 21:10:06 -0400 Original-Received: from [195.159.176.226] (port=36802 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1cvZST-0003aZ-Em for emacs-devel@gnu.org; Tue, 04 Apr 2017 21:10:01 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1cvZSB-0000zR-6J for emacs-devel@gnu.org; Wed, 05 Apr 2017 03:09:43 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 15 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:fRopBr5brTQOTPuElcgq7WEFYFQ= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 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:213661 Archived-At: > In looking at the 'record' feature recently added to master, I noticed that > (record 'integer 'foo 'bar) returns a value V such that (type-of V) yields > the symbol 'integer', even though V is not an integer. Is this intended? Yes. `record` is just a primitive on top of which we can build things (e.g. cl-defstruct or EIEIO). > Or should 'record' and 'make-record' reject attempts to build records > that pretend to be of primitive types? I don't see the benefit in trying to try hard to prevent the user from shooting himself in the foot. Stefan