CWG2783 Handling of deduction guides in global-module-fragment

Author: burblebee

source/modules.tex

@@ -662,6 +662,9 @@
 a partial or explicit specialization or
 an implicit or explicit instantiation of that template, or
 \item
+$M$ declares a class template
+and $D$ is a deduction guide for that template, or
+\item
 one of $D$ and $M$ declares a class or enumeration type
 and the other introduces a typedef name for linkage purposes for that type.
 \end{itemize}