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From: "ed at catmur dot uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108468] New: ICE in
 most_specialized_partial_spec/builtin_guide_p in C++20 mode
Date: Thu, 19 Jan 2023 17:54:52 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.0
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X-Bugzilla-Who: ed at catmur dot uk
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108468

            Bug ID: 108468
           Summary: ICE in most_specialized_partial_spec/builtin_guide_p
                    in C++20 mode
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ed at catmur dot uk
  Target Milestone: ---

Since 11.1, the following ices in -std=3Dc++20 and later:

template<int> struct C { template<class, class> static constexpr int x =3D =
1; };
template<int I> template<class... A> int C<I>::x<void(A...), void(A...)> =
=3D 2;
int y =3D C<0>::x<void(int), void()>;

0x23ae54e internal_error(char const*, ...)
        ???:0
0xc5b614 deduction_guide_p(tree_node const*)
        ???:0
0xc5be2c builtin_guide_p(tree_node const*)
        ???:0
0xc82bdf most_specialized_partial_spec(tree_node*, int)
        ???:0
0xc83a76 instantiate_template(tree_node*, tree_node*, int)
        ???:0
0xc8c0d8 finish_template_variable(tree_node*, int)
        ???:0
0xcce05f finish_id_expression(tree_node*, tree_node*, tree_node*, cp_id_kin=
d*,
bool, bool, bool*, bool, bool, bool, bool, char const**, unsigned int)
        ???:0=