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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98363] C++ 20 module ICE for fast_io library
Date: Fri, 18 Dec 2020 09:52:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98363

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|needs-bisection,            |
                   |needs-reduction             |

--- Comment #3 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Reduced test-case:

cat pr98363.C
module;
# 1 "" 1
template <typename _Derived, typename _Base>
concept derived_from =3D __is_base_of(_Base, _Derived);
namespace ranges {
int swap;
}
template <typename> concept swappable =3D requires { ranges::swap; };
template <typename _Tp> concept movable =3D swappable<_Tp>;
namespace __detail {
template <typename _Tp, typename>
concept __weakly_eq_cmp_with =3D requires(_Tp __t) {
  __t;
};
} // namespace __detail
template <typename> struct iterator_traits;
struct input_iterator_tag;
namespace __detail {
template <typename _Iter> using __iter_concept =3D _Iter;
}
template <typename _Iter> concept weakly_incrementable =3D movable<_Iter>;
template <typename _Iter>
concept input_or_output_iterator =3D weakly_incrementable<_Iter>;
template <typename _Sent, typename _Iter>
concept sentinel_for =3D __detail::__weakly_eq_cmp_with<_Sent, _Iter>;
template <typename _Iter>
concept input_iterator =3D
    derived_from<__detail::__iter_concept<_Iter>, input_iterator_tag>;
template <typename> struct iterator;
template <typename _Iterator>
class reverse_iterator
    : iterator<typename iterator_traits<_Iterator>::value_type> {};
template <input_or_output_iterator _It, sentinel_for<_It>>
class common_iterator;
template <input_iterator _It, typename _Sent>
struct iterator_traits<common_iterator<_It, _Sent>>;
class basic_string_view {
  using value_type =3D int;
  using const_iterator =3D value_type;
  using const_reverse_iterator =3D reverse_iterator<const_iterator>;
};
# 3 "" 2
export module hello;
void greeter(basic_string_view);

Started with r11-6084-g4efde6781bba8d64.=