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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/104577] needs copy constructor for class non-type template
 parameter
Date: Fri, 18 Feb 2022 01:14:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104577

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-02-18
            Summary|needs copy constructor to   |needs copy constructor for
                   |call method of class        |class non-type template
                   |non-type template parameter |parameter
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, it is for more than just calling a method on the non-type templa=
te
argument even.
Here is testcase which shows that:
struct S
{
  constexpr S () =3D default;
  constexpr S (S &&) =3D delete;
  constexpr S (const S &) =3D delete;
};

template <S s>=20
struct i
{
    int y =3D 1;
};

int main ()
{
  return i <S { }>{}.y;
}=