Merge 2023-02 CWG Motion 9

P2788R0 Linkage for modular constants

Author: tkoeppe

source/basic.tex

@@ -2629,8 +2629,11 @@
 \item
   a non-template variable of non-volatile const-qualified type, unless
   \begin{itemize}
+  \item it is declared in the purview of a module interface unit
+    (outside the \grammarterm{private-module-fragment}, if any) or
+    module partition, or
   \item it is explicitly declared \keyword{extern}, or
-  \item it is inline or exported, or
+  \item it is inline, or
   \item it was previously declared and the prior declaration did
   not have internal linkage; or
   \end{itemize}