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From: "jlame646 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109621] New: GCC accepts invalid program with multiple
 using declarations
Date: Tue, 25 Apr 2023 10:05:29 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.1.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109621

            Bug ID: 109621
           Summary: GCC accepts invalid program with multiple using
                    declarations
           Product: gcc
           Version: 13.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jlame646 at gmail dot com
  Target Milestone: ---

The following invalid program(afaik) is accepted by gcc and msvc.
https://godbolt.org/z/1Tsx54ro5

```
namespace X=20
{=20
    struct type {};=20
}
namespace Y=20
{=20
    using type =3D int;=20
}
using X::type;
using Y::type;
int main()
{
    auto i =3D sizeof(type); //gcc and msvc accepts this but clang rejects =
this
}
```=