(:named nil) in cl-defstruct (was: new `obarray` type)

[Stefan Monnier <monnier@iro.umontreal.ca>]

>> I can recover some of the speed by adding (:type vector) (:named nil)
>> to the defstruct definition.
> Does that work for you?  It seems to me that (:named nil) does the
> opposite of what you would think.

Oh, right, indeed.  :named works by "present/absent", so you can use

    (:type vector)
    :named

for "named" and just

    (:type vector)

for "unnamed".

Common-Lisp doesn't allow (:named ...), but cl-macs.el treats it
as :named hence the confusion.  I think we should change this to either
disallow (:named ...) or to treat (:named nil) as a way to say "*not*
named".  The patch below does latter.  Any objection?


        Stefan


diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index ee32c3444f..6e95154daa 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -2675,7 +2675,7 @@ cl-defstruct
 	      ((eq opt :type)
 	       (setq type (car args)))
 	      ((eq opt :named)
-	       (setq named t))
+	       (setq named (if args (car args) t)))
 	      ((eq opt :initial-offset)
 	       (setq descs (nconc (make-list (car args) '(cl-skip-slot))
 				  descs)))