[expr.static.cast] Admit integral promotion for cast to enumeration type

Author: jensmaurer

source/expressions.tex

@@ -3865,7 +3865,9 @@
 a complete enumeration type.
 If the enumeration type has a fixed underlying type,
 the value is first converted to that type
-by integral conversion, if necessary, and
+by
+integral promotion\iref{conv.prom} or integral conversion\iref{conv.integral},
+if necessary, and
 then to the enumeration type.
 If the enumeration type does not have a fixed underlying type,
 the value is unchanged