[Bug c++/98718] [modules] use of partitions causes ICE in write_macro_maps

["boris at kolpackov dot net" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98718

--- Comment #1 from Boris Kolpackov <boris at kolpackov dot net> ---
Perhaps this is the same bug but with a simpler reproducer (it points to the
same location):

cat <<EOF >hello-format.mxx
module;

#include <string>

export module hello:format;

namespace hello
{
  export std::string format (const std::string& n)
  {
    return "Hello, " + n + '!';
  }
}
EOF

cat <<EOF >hello.mxx
module;

#include <string>

export module hello;
export import :format;

namespace hello
{
  export void say (const std::string&);
}
EOF

cat <<EOF >mapper.txt
hello hello.gcm
hello:format hello-format.gcm
EOF

g++ -std=c++2a -fmodules-ts -fmodule-mapper=mapper.txt -x c++ -o
hello-format.gcm.o -c hello-format.mxx
g++ -std=c++2a -fmodules-ts -fmodule-mapper=mapper.txt -x c++ -o hello.gcm.o -c
hello.mxx

hello.mxx:5:8: internal compiler error: in write_macro_maps, at
cp/module.cc:16113
    5 | export module hello;
      |        ^~~~~~
0xc60a67 module_state::write_macro_maps(elf_out*, location_map_info&,
module_state_config*, unsigned int*)
        ../../gcc/gcc/cp/module.cc:16113
0xc659f1 module_state::write(elf_out*, cpp_reader*)
        ../../gcc/gcc/cp/module.cc:17727
0xc6bbfd finish_module_processing(cpp_reader*)
        ../../gcc/gcc/cp/module.cc:19747
0xb8a7a1 c_parse_final_cleanups()
        ../../gcc/gcc/cp/decl2.c:5178
0xf0b805 c_common_parse_file()
        ../../gcc/gcc/c-family/c-opts.c:1233