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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103809] spurious reporting of structure redefinition
Date: Wed, 22 Dec 2021 20:42:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103809

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-12-22
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
      Known to fail|                            |10.3.0, 11.2.0, 12.0, 9.4.0
           Keywords|                            |rejects-valid

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed, not a regression.


template<typename T> concept Byte =3D sizeof(T) =3D=3D 1;
template<typename T> concept NotByte =3D sizeof(T) !=3D 1;

namespace priv
{
    template<typename Value>
    struct Struct {};
}

template<Byte T>
struct priv::Struct<T> {};

template<NotByte T>
struct priv::Struct<T> {};


103809.C:14:14: error: redefinition of 'struct priv::Struct<T>'
   14 | struct priv::Struct<T> {};
      |              ^~~~~~~~~
103809.C:11:14: note: previous definition of 'struct priv::Struct<T>'
   11 | struct priv::Struct<T> {};
      |              ^~~~~~~~~=