CWG2283 Missing complete type requirements

Author: burblebee

source/expressions.tex

@@ -3529,6 +3529,9 @@
 if the result type is an lvalue reference type or an rvalue reference to function type,
 an xvalue if the result type is an rvalue reference to object type, and a prvalue
 otherwise.
+If it is a non-void prvalue,
+the type of the function call expression shall be complete,
+except as specified in \ref{dcl.type.decltype}.
 
 \rSec3[expr.type.conv]{Explicit type conversion (functional notation)}