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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/94568] template specialization of equivalent nontype
 template argument involving member pointer considered distinct
Date: Wed, 15 Apr 2020 15:49:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94568

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Another test case, this one not involving pointers.  Somehow the form of the
initializer (=3D 0 vs { }) makes a difference.

$ cat t.C && gcc -O2 -c -Wall -std=3Dc++2a t.C
template <C> struct D { };

constexpr const int i0 =3D 0;
constexpr const int i_{ };

static_assert (i0 =3D=3D i_);

typedef D<C{ { 0, 1 } }>   DC01;
typedef D<C{ { i0, 1 } }>  DC01;
typedef D<C{ { i_, 1 } }>  DC01;
t.C:11:28: error: conflicting declaration =E2=80=98typedef struct D<C{int [=
2]{0, 1}}>
DC01=E2=80=99
   11 | typedef D<C{ { i_, 1 } }>  DC01;
      |                            ^~~~
t.C:10:28: note: previous declaration as =E2=80=98typedef struct D<C{int [2=
]{0, 1}}>
DC01=E2=80=99
   10 | typedef D<C{ { i0, 1 } }>  DC01;
      |                            ^~~~=