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From: "fchelnokov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/102802] New: Selection of inherited operator contrary to
 `using` clause in C++
Date: Sun, 17 Oct 2021 15:17:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102802

            Bug ID: 102802
           Summary: Selection of inherited operator contrary to `using`
                    clause in C++
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fchelnokov at gmail dot com
  Target Milestone: ---

This program is invalid:
```
using A =3D decltype([](int){ return 1; });
using B =3D decltype([](){ return 2; });

struct S : A, B {
    using A::operator();
};

int main() {
    S s;
    static_assert( s() =3D=3D 2 ); // erroneously passes in GCC and Clang
}
```
It must be rejected because A::operator(int) takes 1 argument and B::operat=
or()
shall not be considered. Only MSVC correctly rejects it now:
https://gcc.godbolt.org/z/x6x3aWzoq

Related discussion: https://stackoverflow.com/q/69601650/7325599=