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From: "fchelnokov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113272] New: Wrong specialization of class template
 selected
Date: Mon, 08 Jan 2024 13:23:12 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.2.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113272

            Bug ID: 113272
           Summary: Wrong specialization of class template selected
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fchelnokov at gmail dot com
  Target Milestone: ---

This program

#include <concepts>

template <auto>
struct A;

template <auto p>
  requires std::same_as<decltype(p), const int*>
struct A<p> : std::false_type {};

template <auto p>
  requires std::same_as<decltype(p), int*>
struct A<p> : std::true_type {};

int x =3D 0;
static_assert( A<&x>::value ); ///< try to comment this line
static_assert( !A<(const int *)&x>::value ); ///< GCC fails here

is accepted by Clang and MSVC, but GCC erroneously evaluates the last line.
Online demo: https://godbolt.org/z/5Pqx6TG3W

But if one comments the previous static_assert, then it starts working.=