CWG2843 Undated reference to Unicode makes C++ a moving target

Author: tkoeppe

source/intro.tex

@@ -71,8 +71,8 @@
 Language Specification},
 Standard Ecma-262, third edition, 1999.
 \item
-The Unicode Consortium. \doccite{The Unicode Standard}.
-Available from: \url{https://www.unicode.org/versions/latest/}
+The Unicode Consortium. \doccite{The Unicode Standard}, Version 15.1.
+Available from: \url{https://www.unicode.org/versions/Unicode15.1.0/}
 \end{itemize}
 \indextext{references!normative|)}
 
@@ -874,6 +874,11 @@
 \ref{implimits} lists some quantities that can be subject to limitations and
 a potential minimum supported value for each quantity.
 
+\pnum
+A conforming implementation may use an implementation-defined version
+of the Unicode Standard that is a later version than the one
+referenced in \ref{intro.refs}.
+
 \pnum
 A conforming implementation may have extensions (including
 additional library functions), provided they do not alter the

source/uax31.tex

@@ -48,17 +48,6 @@
 \grammarterm{identifier-start} or
 \grammarterm{identifier} followed by \grammarterm{identifier-continue}.
 
-\rSec2[uaxid.def.rfmt]{R1a Restricted format characters}
-
-\pnum
-If an implementation of \UAX{31} wishes to allow format characters
-such as \unicode{200d}{zero width joiner} or \unicode{200c}{zero width non-joiner}
-it must define a profile allowing them, or
-describe precisely which combinations are permitted.
-
-\pnum
-\Cpp{} does not allow format characters in identifiers, so this does not apply.
-
 \rSec2[uaxid.def.stable]{R1b Stable identifiers}
 
 \pnum

source/xrefdelta.tex

@@ -451,6 +451,9 @@
 \removedxref{type.index.members}
 \removedxref{type.index.hash}
 
+% CWG 2843 removed [uaxid.def.rfmt]
+\removedxref{uaxid.def.rfmt}
+
 %%% Renamed sections.
 %%% Examples:
 %

source/xrefprev

@@ -2594,6 +2594,7 @@ type.index.overview
 type.index.synopsis
 type.info
 typeinfo.syn
+uaxid.def.rfmt
 uncaught.exceptions
 underflow.error
 uninitialized.construct.default