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From: "janezz55 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107514] New: quick crash of gcc due to noexcept
 specification
Date: Thu, 03 Nov 2022 08:36:00 +0000
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X-Bugzilla-Version: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107514

            Bug ID: 107514
           Summary: quick crash of gcc due to noexcept specification
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: janezz55 at gmail dot com
  Target Milestone: ---

The noexcept specification is probably c++ non-complaint, but still causes a
crash:

constexpr void assign_tuple(auto& t, auto&& ...a)
  noexcept(noexcept(
      []<auto ...I>(std::index_sequence<I...>)
        noexcept(noexcept(
            ((std::get<I>(t) =3D std::forward<decltype(a)>(a)), ...)
          )
        )
      {
      }(std::make_index_sequence<sizeof...(a)>())
    )
  )
{
  [&]<auto ...I>(std::index_sequence<I...>)
    noexcept(noexcept(((std::get<I>(t) =3D std::forward<decltype(a)>(a)), .=
..)))
  {
    ((std::get<I>(t) =3D std::forward<decltype(a)>(a)), ...);
  }(std::make_index_sequence<sizeof...(a)>());
}

prog.cc: In instantiation of 'assign_tuple<std::tuple<int, int, int>, int, =
int,
int>(std::tuple<int, int, int>&, int&&, int&&,
int&&)::<lambda(std::index_sequence<I ...>)> [with auto ...I =3D {0, 1, 2};
std::index_sequence<I ...> =3D std::integer_sequence<long unsigned int, 0, =
1,
2>]':
prog.cc:21:4:   required from 'constexpr void assign_tuple(auto:1&, auto:2&&
...) [with auto:1 =3D std::tuple<int, int, int>; auto:2 =3D {int, int, int}=
]'
prog.cc:29:15:   required from here
prog.cc:18:73: internal compiler error: Segmentation fault
   18 |     noexcept(noexcept(((std::get<I>(t) =3D std::forward<decltype(a)=
>(a)),
...)))
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~

The source is here:
https://wandbox.org/permlink/alJJGFEkTE8b7EXn

I can't provide anything else, since I typed it in over at wandbox. I suspe=
ct
the bug is a duplicate anyway. clang does not crash while compiling the
snippet.=