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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/102098] ICE when #include <boost/asio.hpp> with -fmodules-ts
 -std=c++20 since r11-7530-g1e5cdb9f896fb220
Date: Mon, 30 Aug 2021 08:27:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102098

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|ICE when #include           |ICE when #include
                   |<boost/asio.hpp> with       |<boost/asio.hpp> with
                   |-fmodules-ts -std=3Dc++20     |-fmodules-ts -std=3Dc++20
                   |                            |since
                   |                            |r11-7530-g1e5cdb9f896fb220
             Status|WAITING                     |NEW

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

$ cat pr102098.ii
module;
# 1 "" 1 3
struct Trans_NS__V2_error_category {
  virtual equivalent();
};
struct error_condition {
  Trans_NS__V2_error_category &category() const;
};
struct error_category {
  friend Trans_NS__V2_error_category const &to_std_category();
};
template <typename> struct _Rb_tree_iterator {
  typedef _Rb_tree_iterator _Self;
  friend operator=3D=3D(_Self, _Self) {}
};
template <typename _Val> struct _Rb_tree {
  typedef _Rb_tree_iterator<_Val> iterator;
};
template <typename _Key, typename> struct map {
  typedef typename _Rb_tree<_Key>::iterator iterator;
};
struct std_category {
  bool equivalent(const error_condition &) const;
};
map<const error_category *, int>::iterator __trans_tmp_2;
inline Trans_NS__V2_error_category const &to_std_category() {
  map<const error_category *, std_category>::iterator i;
  i =3D=3D __trans_tmp_2;
}
inline bool std_category::equivalent(const error_condition &condition) cons=
t {
  dynamic_cast<std_category *>(&condition.category());
}
# 0 "" 2
export module foo;

Started with r11-7530-g1e5cdb9f896fb220.=