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.