https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113969
--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> --- Created attachment 57449 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57449&action=edit very similar testcase, ICEing in build_enumerator instead $ x86_64-pc-linux-gnu-gcc testcase2.C -wrapper valgrind,-q testcase2.C:2:40: error: expected '}' before 'd' 2 | template <typename = enum struct b { c d } template <> enum struct b { e | ~ ^ testcase2.C:2:40: error: expected '>' before 'd' testcase2.C:2:42: error: expected unqualified-id before '}' token 2 | template <typename = enum struct b { c d } template <> enum struct b { e | ^ testcase2.C:2:42: error: expected declaration before '}' token ==13010== Invalid read of size 2 ==13010== at 0xFA2DF0: build_enumerator(tree_node*, tree_node*, tree_node*, tree_node*, unsigned int) (decl.cc:17438) ==13010== by 0x10930C7: cp_parser_enumerator_definition (parser.cc:21903) ==13010== by 0x10930C7: cp_parser_enumerator_list (parser.cc:21823) ==13010== by 0x10930C7: cp_parser_enum_specifier(cp_parser*) (parser.cc:21754) ==13010== by 0x10772CE: cp_parser_type_specifier(cp_parser*, int, cp_decl_specifier_seq*, bool, int*, bool*) (parser.cc:20034) ==13010== by 0x1078E2D: cp_parser_decl_specifier_seq(cp_parser*, int, cp_decl_specifier_seq*, int*) (parser.cc:16590) ==13010== by 0x10AE38A: cp_parser_single_declaration(cp_parser*, vec<deferred_access_check, va_gc, vl_embed>*, bool, bool, bool*) (parser.cc:33137) ==13010== by 0x10AFA00: cp_parser_explicit_specialization(cp_parser*) (parser.cc:19945) ==13010== by 0x10B3EC5: cp_parser_declaration(cp_parser*, tree_node*) (parser.cc:15499) ==13010== by 0x10B461A: cp_parser_toplevel_declaration (parser.cc:15594) ==13010== by 0x10B461A: cp_parser_translation_unit (parser.cc:5279) ==13010== by 0x10B461A: c_parse_file() (parser.cc:51202) ==13010== by 0x1203D81: c_common_parse_file() (c-opts.cc:1311) ==13010== by 0x18172DD: compile_file() (toplev.cc:447) ==13010== by 0xEC6EDB: do_compile (toplev.cc:2152) ==13010== by 0xEC6EDB: toplev::main(int, char**) (toplev.cc:2308) ==13010== by 0xEC86ED: main (main.cc:39) ==13010== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==13010== testcase2.C:2:72: internal compiler error: Segmentation fault 2 | template <typename = enum struct b { c d } template <> enum struct b { e | ^ 0x1816fe2 crash_signal /repo/gcc-trunk/gcc/toplev.cc:317 0xfa2df0 build_enumerator(tree_node*, tree_node*, tree_node*, tree_node*, unsigned int) /repo/gcc-trunk/gcc/cp/decl.cc:17438 0x10930c7 cp_parser_enumerator_definition /repo/gcc-trunk/gcc/cp/parser.cc:21903 0x10930c7 cp_parser_enumerator_list /repo/gcc-trunk/gcc/cp/parser.cc:21823 0x10930c7 cp_parser_enum_specifier /repo/gcc-trunk/gcc/cp/parser.cc:21754 0x10772ce cp_parser_type_specifier /repo/gcc-trunk/gcc/cp/parser.cc:20034 0x1078e2d cp_parser_decl_specifier_seq /repo/gcc-trunk/gcc/cp/parser.cc:16590 0x10ae38a cp_parser_single_declaration /repo/gcc-trunk/gcc/cp/parser.cc:33137 0x10afa00 cp_parser_explicit_specialization /repo/gcc-trunk/gcc/cp/parser.cc:19945 0x10b3ec5 cp_parser_declaration /repo/gcc-trunk/gcc/cp/parser.cc:15499 0x10b461a cp_parser_toplevel_declaration /repo/gcc-trunk/gcc/cp/parser.cc:15594 0x10b461a cp_parser_translation_unit /repo/gcc-trunk/gcc/cp/parser.cc:5279 0x10b461a c_parse_file() /repo/gcc-trunk/gcc/cp/parser.cc:51202 0x1203d81 c_common_parse_file() /repo/gcc-trunk/gcc/c-family/c-opts.cc:1311 Please submit a full bug report, with preprocessed source (by using -freport-bug). Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions.
