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    CWG Issue 663</TITLE>
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<P><EM>This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21
  Core Issues List revision 118b.
  See http://www.open-std.org/jtc1/sc22/wg21/ for the official
  list.</EM></P>
<P>2025-09-28</P>
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<A NAME="663"></A><H4>663.
  
Valid Cyrillic identifier characters
</H4>
<B>Section: </B>_N2691_.E&#160; [<A href="https://wg21.link/extendid">extendid</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD1
 &#160;&#160;&#160;

 <B>Submitter: </B>Steve Clamage
 &#160;&#160;&#160;

 <B>Date: </B>30 November 2007<BR>


<P>[Voted into the WP at the June, 2008 meeting.]</P>

<P>The C99 and C++ Standards disagree about the validity of two
Cyrillic characters for use in identifiers.  C++ (_N2691_.E [<A href="https://wg21.link/extendid">extendid</A>]) says that 040d is valid in an identifier but that 040e is
not; C99 (Annex D) says exactly the opposite.  In fact, both
characters should be accepted in identifiers; see
<A href="http://www.unicode.org/charts/PDF/U0400.pdf">the
Unicode chart</A>.</P>

<P><B>Proposed resolution (February, 2008):</B></P>

<P>The reference in paragraph 2 should be changed to ISO/IEC TR 10176:2003
and the table should be changed to conform to the one in that document
(beginning on page 34).  
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