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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++/111357] __integer_pack fails to work with values of
 dependent type convertible to integers in noexcept context
Date: Sun, 10 Sep 2023 03:52:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111357

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-09-10
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced slightly:
```
#include <utility>

using std::integer_sequence;
using std::make_integer_sequence;

template<int... V>
void g(integer_sequence<int,V...>)
{}

template<typename ...T>
struct c1
{
  static constexpr int value =3D 1;
  constexpr operator int() { return value; }=20
};
template<typename T>
struct R
{
        using S =3D make_integer_sequence<int,c1<T>{}>;

        R() noexcept(noexcept(g(S())))
        {}
};
int main()
{
        R<int>();
}
```

The obvious workaround in this case (and the tuple_size case) is to use
`::value` (or tuple_size_v ).=