Subject: Re: bug#22840: 25.0.91; eieio clone creates objects with wrong name

From: Vitalie Spinu <[email-masked]>
Date: Sun, 28 Feb 2016 20:26:19 +0100

The problem seems to be because of the typo in clone for named objects. It
should be setting name to "nobj" but instead it sets to the prototype "obj":

╭──────── #475 ─ /lisp/emacs-lisp/eieio-base.el ──
│ 
│ (cl-defmethod clone ((obj eieio-named) &rest params)
│   "Clone OBJ, initializing `:parent' to OBJ.
│ All slots are unbound, except those initialized with PARAMS."
│   (let* ((newname (and (stringp (car params)) (pop params)))
│          (nobj (apply #'cl-call-next-method obj params))
│          (nm (slot-value obj 'object-name)))
│     (eieio-oset obj 'object-name
│                 (or newname
│                     (save-match-data
│                       (if (and nm (string-match "-\\([0-9]+\\)" nm))
│                           (let ((num (1+ (string-to-number
│                                           (match-string 1 nm)))))
│                             (concat (substring nm 0 (match-beginning 0))
│                                     "-" (int-to-string num)))
│                         (concat nm "-1")))))
│     nobj))
╰──────── #491 ─

  Vitalie

>> On Sun, Feb 28 2016 20:14, Vitalie Spinu wrote:

> Hi,

> With new "named" class I encounter the following problem:

> (defclass AA (eieio-instance-inheritor eieio-named) ()
>   "Soeme class")

> (setq aa (AA "namedA"))
> (eieio-object-name aa)
> ;"#<AA namedA>"
> (eieio-object-name (clone aa "namedB"))
> ;"#<AA namedA>"
> (eieio-object-name (clone aa "namedC"))
> ;"#<AA namedB>"

> In other words clone memorises a name from the previous clone and uses
> that during the object creation.

>    Vitalie

> In GNU Emacs 25.0.91.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.7)
>  of 2016-02-28 built on galago
> Repository revision: 52f64cc2e74ab83752c8f2d37ef0fc6df5ef8b30
> Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
> System Description:	Ubuntu 15.10