https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99479

--- Comment #9 from Alexander Lelyakin <alexander.lelyakin at googlemail dot 
com> ---
Todays shortest sequence:

usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header
condition_variable
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header iosfwd
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header future
----
In file included from /usr/local/include/c++/11.0.1/string:43,
                 from /usr/local/include/c++/11.0.1/stdexcept:39,
                 from /usr/local/include/c++/11.0.1/system_error:41,
                 from /usr/local/include/c++/11.0.1/mutex:42,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/localefwd.h:156:74: error: wrong number of
template arguments (1, should be 2)
  156 |   template<typename _CharT, typename _InIter =
istreambuf_iterator<_CharT> >
      |                                                                        
 ^
In file included from /usr/local/include/c++/11.0.1/array:40,
                 from /usr/local/include/c++/11.0.1/tuple:39,
                 from /usr/local/include/c++/11.0.1/mutex:38,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/stl_algobase.h:451:11: note: provided for
‘template<class _CharT, class _Traits> class std::istreambuf_iterator’
  451 |     class istreambuf_iterator;
      |           ^~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/11.0.1/string:43,
                 from /usr/local/include/c++/11.0.1/stdexcept:39,
                 from /usr/local/include/c++/11.0.1/system_error:41,
                 from /usr/local/include/c++/11.0.1/mutex:42,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/localefwd.h:158:75: error: wrong number of
template arguments (1, should be 2)
  158 |   template<typename _CharT, typename _OutIter =
ostreambuf_iterator<_CharT> >
      |                                                                        
  ^
In file included from /usr/local/include/c++/11.0.1/array:40,
                 from /usr/local/include/c++/11.0.1/tuple:39,
                 from /usr/local/include/c++/11.0.1/mutex:38,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/stl_algobase.h:454:11: note: provided for
‘template<class _CharT, class _Traits> class std::ostreambuf_iterator’
  454 |     class ostreambuf_iterator;
      |           ^~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/11.0.1/string:43,
                 from /usr/local/include/c++/11.0.1/stdexcept:39,
                 from /usr/local/include/c++/11.0.1/system_error:41,
                 from /usr/local/include/c++/11.0.1/mutex:42,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/localefwd.h:177:75: error: wrong number of
template arguments (1, should be 2)
  177 |   template<typename _CharT, typename _InIter = 
istreambuf_iterator<_CharT> >
      |                                                                        
  ^
In file included from /usr/local/include/c++/11.0.1/array:40,
                 from /usr/local/include/c++/11.0.1/tuple:39,
                 from /usr/local/include/c++/11.0.1/mutex:38,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/stl_algobase.h:451:11: note: provided for
‘template<class _CharT, class _Traits> class std::istreambuf_iterator’
  451 |     class istreambuf_iterator;
      |           ^~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/11.0.1/string:43,
                 from /usr/local/include/c++/11.0.1/stdexcept:39,
                 from /usr/local/include/c++/11.0.1/system_error:41,
                 from /usr/local/include/c++/11.0.1/mutex:42,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/localefwd.h:179:75: error: wrong number of
template arguments (1, should be 2)
  179 |   template<typename _CharT, typename _InIter = 
istreambuf_iterator<_CharT> >
      |                                                                        
  ^
In file included from /usr/local/include/c++/11.0.1/array:40,
                 from /usr/local/include/c++/11.0.1/tuple:39,
                 from /usr/local/include/c++/11.0.1/mutex:38,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/stl_algobase.h:451:11: note: provided for
‘template<class _CharT, class _Traits> class std::istreambuf_iterator’
  451 |     class istreambuf_iterator;
      |           ^~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/11.0.1/string:43,
                 from /usr/local/include/c++/11.0.1/stdexcept:39,
                 from /usr/local/include/c++/11.0.1/system_error:41,
                 from /usr/local/include/c++/11.0.1/mutex:42,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/localefwd.h:182:75: error: wrong number of
template arguments (1, should be 2)
  182 |   template<typename _CharT, typename _OutIter =
ostreambuf_iterator<_CharT> >
      |                                                                        
  ^
In file included from /usr/local/include/c++/11.0.1/array:40,
                 from /usr/local/include/c++/11.0.1/tuple:39,
                 from /usr/local/include/c++/11.0.1/mutex:38,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/stl_algobase.h:454:11: note: provided for
‘template<class _CharT, class _Traits> class std::ostreambuf_iterator’
  454 |     class ostreambuf_iterator;
      |           ^~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/11.0.1/string:43,
                 from /usr/local/include/c++/11.0.1/stdexcept:39,
                 from /usr/local/include/c++/11.0.1/system_error:41,
                 from /usr/local/include/c++/11.0.1/mutex:42,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/localefwd.h:184:75: error: wrong number of
template arguments (1, should be 2)
  184 |   template<typename _CharT, typename _OutIter =
ostreambuf_iterator<_CharT> >
      |                                                                        
  ^
In file included from /usr/local/include/c++/11.0.1/array:40,
                 from /usr/local/include/c++/11.0.1/tuple:39,
                 from /usr/local/include/c++/11.0.1/mutex:38,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/stl_algobase.h:454:11: note: provided for
‘template<class _CharT, class _Traits> class std::ostreambuf_iterator’
  454 |     class ostreambuf_iterator;
      |           ^~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/11.0.1/string:43,
                 from /usr/local/include/c++/11.0.1/stdexcept:39,
                 from /usr/local/include/c++/11.0.1/system_error:41,
                 from /usr/local/include/c++/11.0.1/mutex:42,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/localefwd.h:190:75: error: wrong number of
template arguments (1, should be 2)
  190 |   template<typename _CharT, typename _InIter = 
istreambuf_iterator<_CharT> >
      |                                                                        
  ^
In file included from /usr/local/include/c++/11.0.1/array:40,
                 from /usr/local/include/c++/11.0.1/tuple:39,
                 from /usr/local/include/c++/11.0.1/mutex:38,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/stl_algobase.h:451:11: note: provided for
‘template<class _CharT, class _Traits> class std::istreambuf_iterator’
  451 |     class istreambuf_iterator;
      |           ^~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/11.0.1/string:43,
                 from /usr/local/include/c++/11.0.1/stdexcept:39,
                 from /usr/local/include/c++/11.0.1/system_error:41,
                 from /usr/local/include/c++/11.0.1/mutex:42,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/localefwd.h:192:75: error: wrong number of
template arguments (1, should be 2)
  192 |   template<typename _CharT, typename _OutIter =
ostreambuf_iterator<_CharT> >
      |                                                                        
  ^
In file included from /usr/local/include/c++/11.0.1/array:40,
                 from /usr/local/include/c++/11.0.1/tuple:39,
                 from /usr/local/include/c++/11.0.1/mutex:38,
                 from /usr/local/include/c++/11.0.1/future:38:
/usr/local/include/c++/11.0.1/bits/stl_algobase.h:454:11: note: provided for
‘template<class _CharT, class _Traits> class std::ostreambuf_iterator’
  454 |     class ostreambuf_iterator;
      |           ^~~~~~~~~~~~~~~~~~~
corrupted double-linked list
corrupted double-linked list
g++: internal compiler error: Aborted signal terminated program cc1plus
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
----
g++ (GCC) 11.0.1 20210416 (experimental)
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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