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From: "xmh970252187 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99263] New: A qualified-id that denotes a destructor of a
 class type that is used as an operand of `typeid` is accepted by GCC
Date: Thu, 25 Feb 2021 08:11:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99263

            Bug ID: 99263
           Summary: A qualified-id that denotes a destructor of a class
                    type that is used as an operand of `typeid` is
                    accepted by GCC
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: xmh970252187 at gmail dot com
  Target Milestone: ---

````cpp
#include <iostream>
struct A{
    ~A(){}
};
int main(){
    std::cout<< typeid(A::~A).name();
}
````
In this usage, A::~A should be an invalid operand of typeid, as per
[https://timsong-cpp.github.io/cppwp/n4861/expr.prim.id#2]=20

> An id-expression that denotes a non-static data member or non-static memb=
er function of a class can only be used:
>> as part of a class member access in which the object expression refers t=
o the member's class57 or a class derived from that class, or
>> to form a pointer to member ([expr.unary.op]), or
>> if that id-expression denotes a non-static data member and it appears in=
 an unevaluated operand.

None of the contexts listed in the above list is satisfied by this usage.
Hence, take the `A::~A` as an operand of `typeid` should be considered as an
invalid usage.=