[Bug c++/99246] [modules] ICE in write_location, at cp/module.cc:15687

["alexander.lelyakin at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99246

--- Comment #4 from Alexander Lelyakin <alexander.lelyakin at googlemail dot com> ---
This report is marked as resolved, but it is stable reproducible all the time.

/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header bit
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header istream
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header cmath
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header locale
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header bitset
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header shared_mutex
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header new
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header ciso646
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header memory
/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 thread
/usr/local/bin/g++ -std=c++20 -fmodules-ts -x c++-system-header regex
----
In module imported at /usr/local/include/c++/11.0.1/sstream:38:1,
        included from /usr/local/include/c++/11.0.1/regex:46:
/usr/local/include/c++/11.0.1/istream: note: unable to represent further
imported source locations
/usr/local/include/c++/11.0.1/regex: internal compiler error: in
write_location, at cp/module.cc:15593
0x6e02cf module_state::write_location(bytes_out&, unsigned int)
        ../../gcc/gcc/cp/module.cc:15593
0xa60ff3 trees_out::core_vals(tree_node*)
        ../../gcc/gcc/cp/module.cc:5900
0xa64464 trees_out::tree_node_vals(tree_node*)
        ../../gcc/gcc/cp/module.cc:7050
0xa64464 trees_out::tree_value(tree_node*)
        ../../gcc/gcc/cp/module.cc:8887
0xa604f4 trees_out::tree_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:9085
0xa6484a trees_out::write_var_def(tree_node*)
        ../../gcc/gcc/cp/module.cc:11472
0xa65ae5 module_state::write_cluster(elf_out*, depset**, unsigned int,
depset::hash&, unsigned int*, unsigned int*)
        ../../gcc/gcc/cp/module.cc:14648
0xa6743e module_state::write(elf_out*, cpp_reader*)
        ../../gcc/gcc/cp/module.cc:17720
0xa6801f finish_module_processing(cpp_reader*)
        ../../gcc/gcc/cp/module.cc:19831
0x9fb4cb c_parse_final_cleanups()
        ../../gcc/gcc/cp/decl2.c:5175
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 20210330 (experimental)
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