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From: "fchelnokov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/115594] New: requires expression permits arrays of voids
Date: Sat, 22 Jun 2024 21:32:29 +0000
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X-Bugzilla-Version: 14.1.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115594

            Bug ID: 115594
           Summary: requires expression permits arrays of voids
           Product: gcc
           Version: 14.1.1
            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
```
template<typename T>
concept C =3D requires(T t[2]) {
    t;
};

static_assert(!C<void>);
```
seems valid because arrays of voids are not allowed, and it is accepted by
Clang and MSVC. But in GCC static_assert evaluates to opposite value. Online
demo: https://gcc.godbolt.org/z/nM8Mj8qrb=