bug#9653: 24.0.50; `ucs-names' - Why all of the ("" . XXX) entries?

[Eli Zaretskii]

> From: "Drew Adams" <drew.adams@oracle.com>
> Cc: "'Eli Zaretskii'" <eliz@gnu.org>, <9653@debbugs.gnu.org>
> Date: Tue, 4 Oct 2011 15:03:27 -0700
> 
> I supposed, however, that each empty-name alist entry has an alter-ego entry
> that has the same code point but also has a non-empty name: e.g. ("" . 32) &
> ("SPACE" . 32).

Yes, each character code is entered into the alist twice: once with
its name, and another time with its "old name", which is empty for
most of the characters.  I thought the code fragment I posted made
that clear.

> I see in fact that there are
> some `ucs-names' entries that, yes, constitute a pair with the same character
> code, yet _both_ are empty.  E.g., ("" . 11565) & ("" . 11565).

These are undefined characters.  11565 is hex 2d2d; you will not find
such a codepoint in the Unicode database.