https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99283

--- Comment #8 from Alexander Lelyakin <alexander.lelyakin at googlemail dot 
com> ---
Still reproducible:
----
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header charconv
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header fstream
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header mutex
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cfloat
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header stdexcept
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header ios
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header filesystem
----
In file included from /usr/local/include/c++/11.0.1/bits/unique_ptr.h:42,
                 from /usr/local/include/c++/11.0.1/bits/locale_conv.h:41,
                 from /usr/local/include/c++/11.0.1/locale:43,
                 from /usr/local/include/c++/11.0.1/bits/fs_path.h:37,
                 from /usr/local/include/c++/11.0.1/filesystem:45:
/usr/local/include/c++/11.0.1/ostream:58:42: internal compiler error: in
assert_definition, at cp/module.cc:4484
   58 |     class basic_ostream : virtual public basic_ios<_CharT, _Traits>
      |                                          ^~~~~~~~~
0x6e204d trees_in::assert_definition(tree_node*, bool)
        ../../gcc/gcc/cp/module.cc:4484
0xa5d810 trees_in::odr_duplicate(tree_node*, bool)
        ../../gcc/gcc/cp/module.cc:11362
0xa6d773 trees_in::read_class_def(tree_node*, tree_node*)
        ../../gcc/gcc/cp/module.cc:11842
0xa6f4a1 module_state::read_cluster(unsigned int)
        ../../gcc/gcc/cp/module.cc:14855
0xa6fb1d module_state::load_section(unsigned int, binding_slot*)
        ../../gcc/gcc/cp/module.cc:18117
0xa6fcd8 lazy_load_binding(unsigned int, tree_node*, tree_node*, binding_slot*)
        ../../gcc/gcc/cp/module.cc:18811
0xa81ace name_lookup::search_namespace_only(tree_node*)
        ../../gcc/gcc/cp/name-lookup.c:928
0xa830fb name_lookup::search_unqualified(tree_node*, cp_binding_level*)
        ../../gcc/gcc/cp/name-lookup.c:1158
0xa84cf4 lookup_name_1
        ../../gcc/gcc/cp/name-lookup.c:7802
0xa84eba lookup_name(tree_node*, LOOK_where, LOOK_want)
        ../../gcc/gcc/cp/name-lookup.c:7822
0xa94c62 lookup_name(tree_node*, LOOK_want)
        ../../gcc/gcc/cp/name-lookup.h:401
0xa94c62 cp_parser_lookup_name
        ../../gcc/gcc/cp/parser.c:29368
0xabd58f cp_parser_template_name
        ../../gcc/gcc/cp/parser.c:17708
0xabdacf cp_parser_template_id
        ../../gcc/gcc/cp/parser.c:17317
0xabe32b cp_parser_class_name
        ../../gcc/gcc/cp/parser.c:24685
0xab589a cp_parser_qualifying_entity
        ../../gcc/gcc/cp/parser.c:7002
0xab589a cp_parser_nested_name_specifier_opt
        ../../gcc/gcc/cp/parser.c:6684
0xaa96ac cp_parser_base_specifier
        ../../gcc/gcc/cp/parser.c:26704
0xaa96ac cp_parser_base_clause
        ../../gcc/gcc/cp/parser.c:26557
0xaa96ac cp_parser_class_head
        ../../gcc/gcc/cp/parser.c:25644
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
----
g++ (GCC) 11.0.1 20210323 (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.

gcc at commit be70bb5e4babdf9d3d33e8f4658452038407fa8e

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