https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99274
--- Comment #1 from Alexander Lelyakin <alexander.lelyakin at googlemail dot
com> ---
Previously I have seen such message only in connection with <iosfwd>,
but it happends also without it.
Another header causing such error is <regex>:
g++ -std=c++20 -fmodules-ts -x c++-system-header iterator
g++ -std=c++20 -fmodules-ts -x c++-system-header regex
----
In file included from /usr/local/include/c++/11.0.1/locale:40,
from /usr/local/include/c++/11.0.1/regex:44:
/usr/local/include/c++/11.0.1/bits/locale_facets.h:121:31: error: wrong number
of template arguments (1, should be 2)
121 | ostreambuf_iterator<_CharT>
| ^
In file included from /usr/local/include/c++/11.0.1/algorithm:61,
from /usr/local/include/c++/11.0.1/regex: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/locale:40,
from /usr/local/include/c++/11.0.1/regex:44:
/usr/local/include/c++/11.0.1/bits/locale_facets.h:122:39: error: wrong number
of template arguments (1, should be 2)
122 | __write(ostreambuf_iterator<_CharT> __s, const _CharT* __ws, int
__len)
| ^
In file included from /usr/local/include/c++/11.0.1/algorithm:61,
from /usr/local/include/c++/11.0.1/regex: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/locale:40,
from /usr/local/include/c++/11.0.1/regex:44:
/usr/local/include/c++/11.0.1/bits/locale_facets.h: In function ‘int
std::__write(int, const _CharT*, int)’:
/usr/local/include/c++/11.0.1/bits/locale_facets.h:124:11: error: request for
member ‘_M_put’ in ‘__s’, which is of non-class type ‘int’
124 | __s._M_put(__ws, __len);
| ^~~~~~
/usr/local/include/c++/11.0.1/regex: At global scope:
/usr/local/include/c++/11.0.1/regex: warning: not writing module
‘/usr/local/include/c++/11.0.1/regex’ due to errors
----
g++ (GCC) 11.0.1 20210312 (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.
