[Bug c++/99915] New: [modules] ICE in write_location

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99915

            Bug ID: 99915
           Summary: [modules] ICE in write_location
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alexander.lelyakin at googlemail dot com
  Target Milestone: ---

This ICE is very similar to 99246, but it is closed as fixed.
So I assume that it is a new bug with similar symptoms.

/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:15607
0x6de279 module_state::write_location(bytes_out&, unsigned int)
        ../../gcc/gcc/cp/module.cc:15607
0xa67153 trees_out::core_vals(tree_node*)
        ../../gcc/gcc/cp/module.cc:5904
0xa6a5c4 trees_out::tree_node_vals(tree_node*)
        ../../gcc/gcc/cp/module.cc:7054
0xa6a5c4 trees_out::tree_value(tree_node*)
        ../../gcc/gcc/cp/module.cc:8890
0xa66654 trees_out::tree_node(tree_node*)
        ../../gcc/gcc/cp/module.cc:9088
0xa6a9aa trees_out::write_var_def(tree_node*)
        ../../gcc/gcc/cp/module.cc:11475
0xa6bc45 module_state::write_cluster(elf_out*, depset**, unsigned int,
depset::hash&, unsigned int*, unsigned int*)
        ../../gcc/gcc/cp/module.cc:14662
0xa6d5ce module_state::write(elf_out*, cpp_reader*)
        ../../gcc/gcc/cp/module.cc:17734
0xa6e338 finish_module_processing(cpp_reader*)
        ../../gcc/gcc/cp/module.cc:19845
0xa014cb 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 20210405 (experimental)
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