g++ 13.0.0 20220925 snapshot (g:77bbf69d2981dafc2ef3e59bfbefb645d88bab9d) ICEs when compiling the following testcase, reduced from test/Modules/template-function-specialization.cpp from the clang 15.0.1 test suite: export template <> void foo4<int>() { } % g++-13.0.0 -std=c++20 -w -c rnforwjm.cpp rnforwjm.cpp:1:18: error: invalid explicit specialization before '>' token 1 | export template <> | ^ rnforwjm.cpp:1:18: internal compiler error: Segmentation fault 0x11dc98f crash_signal /var/tmp/portage/sys-devel/gcc-13.0.0_p20220925/work/gcc-13-20220925/gcc/toplev.cc:314 0x9c7cd6 tree_check(tree_node*, char const*, int, char const*, tree_code) /var/tmp/portage/sys-devel/gcc-13.0.0_p20220925/work/gcc-13-20220925/gcc/tree.h:3519 0x9c7cd6 get_shorthand_constraints(tree_node*) /var/tmp/portage/sys-devel/gcc-13.0.0_p20220925/work/gcc-13-20220925/gcc/cp/constraint.cc:1558 0xb2de2b cp_parser_explicit_template_declaration /var/tmp/portage/sys-devel/gcc-13.0.0_p20220925/work/gcc-13-20220925/gcc/cp/parser.cc:31825 0xb3094a cp_parser_declaration /var/tmp/portage/sys-devel/gcc-13.0.0_p20220925/work/gcc-13-20220925/gcc/cp/parser.cc:15038 0xb31509 cp_parser_toplevel_declaration /var/tmp/portage/sys-devel/gcc-13.0.0_p20220925/work/gcc-13-20220925/gcc/cp/parser.cc:15130 0xb31509 cp_parser_translation_unit /var/tmp/portage/sys-devel/gcc-13.0.0_p20220925/work/gcc-13-20220925/gcc/cp/parser.cc:5068 0xb31509 c_parse_file() /var/tmp/portage/sys-devel/gcc-13.0.0_p20220925/work/gcc-13-20220925/gcc/cp/parser.cc:48606 0xc6e3a1 c_common_parse_file() /var/tmp/portage/sys-devel/gcc-13.0.0_p20220925/work/gcc-13-20220925/gcc/c-family/c-opts.cc:1255