<HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<TITLE>
    CWG Issue 932</TITLE>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<STYLE TYPE="text/css">
  INS { text-decoration:none; font-weight:bold; background-color:#A0FFA0 }
  .INS { text-decoration:none; background-color:#D0FFD0 }
  DEL { text-decoration:line-through; background-color:#FFA0A0 }
  .DEL { text-decoration:line-through; background-color: #FFD0D0 }
  @media (prefers-color-scheme: dark) {
    HTML { background-color:#202020; color:#f0f0f0; }
    A { color:#5bc0ff; }
    A:visited { color:#c6a8ff; }
    A:hover, a:focus { color:#afd7ff; }
    INS { background-color:#033a16; color:#aff5b4; }
    .INS { background-color: #033a16; }
    DEL { background-color:#67060c; color:#ffdcd7; }
    .DEL { background-color:#67060c; }
  }
  SPAN.cmnt { font-family:Times; font-style:italic }
</STYLE>
</HEAD>
<BODY>
<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>
<HR>
<A NAME="932"></A><H4>932.
  
UCNs in closing delimiters of raw string literals
</H4>
<B>Section: </B>5.13.5&#160; [<A href="https://wg21.link/lex.string">lex.string</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD2
 &#160;&#160;&#160;

 <B>Submitter: </B>Alisdair Meredith
 &#160;&#160;&#160;

 <B>Date: </B>7 July, 2009<BR>


<P>[Voted into WP at March, 2010 meeting.]</P>



<P>Since members of the basic source character set can be written inside
a string using a universal character name, it is not clear whether a UCN
that represents <TT>']'</TT> or one of the characters in the terminating
<I>d-char-sequence</I> should be interpreted as that character or as
an attempt to &#8220;escape&#8221; that character and prevent its
interpretation as part of the terminating sequence of a raw character
string.</P>

<P><B>Notes from the July, 2009 meeting:</B></P>

<P>The CWG supported a resolution in which the <I>d-char-sequence</I>
of a raw string literal is considered to be outside the literal and
thus, by 5.3.1 [<A href="https://wg21.link/lex.charset#2">lex.charset</A>] paragraph 2, could not contain a UCN
designating a member of the basic source character set.</P>

<P><B>Proposed resolution (October, 2009):</B></P>

<P>Change 5.3.1 [<A href="https://wg21.link/lex.charset#2">lex.charset</A>] paragraph 2 as follows:</P>

<BLOCKQUOTE>

Additionally, if the hexadecimal value for a universal-character-name
outside <INS>the <I>c-char-sequence</I>, <I>s-char-sequence</I>, or
<I>r-char-sequence</I> of</INS> a character or string literal
corresponds to a control character (in either of the ranges 0x00-0x1F
or 0x7F-0x9F, both inclusive) or to a character in the basic source
character set, the program is ill-formed.

</BLOCKQUOTE>

<BR><BR>
</BODY>
</HTML>
