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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/105520] Ignores constraint in auto declaration with
 braced-init-list
Date: Sat, 06 Apr 2024 21:30:49 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 10.0
X-Bugzilla-Keywords: accepts-invalid
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105520

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
             Blocks|                            |67491
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-04-06

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

This works as expected, in that we are getting the correct type for auto he=
re:
```
#include <concepts>
#include <initializer_list>

template <typename T>
concept always_true =3D true;

template <typename T>
concept always_false =3D false;

template <typename>
inline constexpr bool is_init_list_v =3D false;

template <typename T>
inline constexpr bool is_init_list_v<std::initializer_list<T>> =3D true;

template <typename T>
concept not_init_list =3D !is_init_list_v<std::remove_cvref_t<T>>;
template <typename T>
inline constexpr bool not_init_list1 =3D !is_init_list_v<std::remove_cvref_=
t<T>>;


int main() {
    auto f =3D {1, 2, 3};
    static_assert(!not_init_list<decltype(f)>);
    static_assert(!not_init_list1<decltype(f)>);
}
```


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D67491
[Bug 67491] [meta-bug] concepts issues=