[expr.typeid] glvalue of incomplete type vs typeid

````cpp
struct C;
int storage;
C* ptr = (C*)&storage;
typeid(*ptr);  //#1
````
All compilers report `#1` is an error, with the diagnosis `invalid use of incomplete type`. However, there's no relevant rule in the standard that restricts the type of the glvalue operand in [expr.typeid]. Is it an omission?