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From: "ted at lyncon dot se" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/114625] New: requires { T{}; } wrongly accepted when T{} is
 ill-formed
Date: Sun, 07 Apr 2024 08:38:25 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: ted at lyncon dot se
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114625

            Bug ID: 114625
           Summary: requires { T{}; } wrongly accepted when T{} is
                    ill-formed
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ted at lyncon dot se
  Target Milestone: ---

This program compiles but I'd expect both `static_assert`s to refuse it sin=
ce
`d x{};` is invalid.
```
#include <concepts>

template<class T>
concept default_initializable =3D
    std::constructible_from<T> &&
    requires { T{}; } &&
    requires { ::new T; };

struct b { explicit b(auto...) {} };
struct d : b {};

int main() {
    static_assert(default_initializable<d>);
    static_assert(std::default_initializable<d>);
    //d x{}; // ERROR
}
```=