https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111224
--- Comment #1 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
The stack trace in g++.log:
/home/xry111/git-repos/gcc/gcc/testsuite/g++.dg/modules/xtreme-header-1_a.H:
internal compiler error: in core_vals, at cp/module.cc:6108
0x9563a3 trees_out::core_vals(tree_node*)
../../gcc/gcc/cp/module.cc:6108
0x95a5af trees_out::tree_node_vals(tree_node*)
../../gcc/gcc/cp/module.cc:7218
0x95a5af trees_out::tree_value(tree_node*)
../../gcc/gcc/cp/module.cc:9083
0x954463 trees_out::tree_node(tree_node*)
../../gcc/gcc/cp/module.cc:9281
0x955423 trees_out::core_vals(tree_node*)
../../gcc/gcc/cp/module.cc:5998
0x958cbb trees_out::tree_node_vals(tree_node*)
../../gcc/gcc/cp/module.cc:7218
0x958cbb trees_out::fn_parms_init(tree_node*)
../../gcc/gcc/cp/module.cc:10189
0x952233 trees_out::decl_value(tree_node*, depset*)
../../gcc/gcc/cp/module.cc:7782
0x95d017 depset::hash::find_dependencies(module_state*)
../../gcc/gcc/cp/module.cc:13328
0x95df5b module_state::write_begin(elf_out*, cpp_reader*, module_state_config&,
unsigned int&)
../../gcc/gcc/cp/module.cc:17895
0x95f1ef finish_module_processing(cpp_reader*)
../../gcc/gcc/cp/module.cc:20237
0x8c8feb c_parse_final_cleanups()
../../gcc/gcc/cp/decl2.cc:5184
0xb95a0f c_common_parse_file()
../../gcc/gcc/c-family/c-opts.cc:1275
