https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99425
--- Comment #1 from Alexander Lelyakin <alexander.lelyakin at googlemail dot
com> ---
There is a shorter sequence:
g++ -std=c++20 -fmodules-ts -x c++-system-header map
g++ -std=c++20 -fmodules-ts -x c++-system-header vector
g++ -std=c++20 -fmodules-ts -x c++-system-header stdexcept
g++ -std=c++20 -fmodules-ts -x c++-system-header span
g++ -std=c++20 -fmodules-ts -x c++-system-header mutex
g++ -std=c++20 -fmodules-ts -x c++-system-header utility
g++ -std=c++20 -fmodules-ts -x c++-system-header ctime
g++ -std=c++20 -fmodules-ts -x c++-system-header forward_list
g++ -std=c++20 -fmodules-ts -x c++-system-header deque
g++ -std=c++20 -fmodules-ts -x c++-system-header variant
g++ -std=c++20 -fmodules-ts -x c++-system-header functional
g++ -std=c++20 -fmodules-ts -x c++-system-header future
----
In file included from /usr/local/include/c++/11.0.1/bits/shared_ptr_base.h:53,
from /usr/local/include/c++/11.0.1/bits/shared_ptr.h:53,
from /usr/local/include/c++/11.0.1/condition_variable:43,
from /usr/local/include/c++/11.0.1/future:39:
/usr/local/include/c++/11.0.1/bits/allocated_ptr.h:58:65: internal compiler
error: tree check: expected tree_vec, have tree_list in
lookup_template_class_1, at cp/pt.c:9803
58 | typename _Req = _Require<is_same<_Ptr, value_type*>>>
| ^
0x875ba8 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
../../gcc/gcc/tree.c:9814
0x71d266 tree_check(tree_node*, char const*, int, char const*, tree_code)
../../gcc/gcc/tree.h:3353
0x71d266 lookup_template_class_1
../../gcc/gcc/cp/pt.c:9803
0xb21d6c lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
../../gcc/gcc/cp/pt.c:10237
0xb49ffb finish_template_type(tree_node*, tree_node*, int)
../../gcc/gcc/cp/semantics.c:3498
0xabbf41 cp_parser_template_id
../../gcc/gcc/cp/parser.c:17444
0xabc12b cp_parser_class_name
../../gcc/gcc/cp/parser.c:24671
0xab36ba cp_parser_qualifying_entity
../../gcc/gcc/cp/parser.c:6994
0xab36ba cp_parser_nested_name_specifier_opt
../../gcc/gcc/cp/parser.c:6676
0xac8e14 cp_parser_simple_type_specifier
../../gcc/gcc/cp/parser.c:18837
0xaa7bad cp_parser_type_specifier
../../gcc/gcc/cp/parser.c:18495
0xab9973 cp_parser_type_specifier_seq
../../gcc/gcc/cp/parser.c:23346
0xab7ff4 cp_parser_type_id_1
../../gcc/gcc/cp/parser.c:23149
0xaba5d3 cp_parser_template_type_arg
../../gcc/gcc/cp/parser.c:23254
0xaba6ff cp_parser_template_argument
../../gcc/gcc/cp/parser.c:17894
0xaba6ff cp_parser_template_argument_list
../../gcc/gcc/cp/parser.c:17805
0xaba6ff cp_parser_enclosed_template_argument_list
../../gcc/gcc/cp/parser.c:30775
0xabba2c cp_parser_template_id
../../gcc/gcc/cp/parser.c:17377
0xabc12b cp_parser_class_name
../../gcc/gcc/cp/parser.c:24671
0xab36ba cp_parser_qualifying_entity
../../gcc/gcc/cp/parser.c:6994
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 20210308 (experimental)
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