https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93028
--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Trying to compile test.cpp from Comment 5 again, I did see an ICE:
internal compiler error: tree check: expected tree that contains ‘decl minimal’
structure, have ‘tree_list’ in lookup_type_scope_1, at cp/name-lookup.c:6492
0x1829be2 tree_contains_struct_check_failed(tree_node const*,
tree_node_structure_enum, char const*, int, char const*)
../../gcc/tree.c:10071
0x83f864 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
../../gcc/tree.h:3311
0xa02cae lookup_type_scope_1
../../gcc/cp/name-lookup.c:6492
0xa02fab lookup_type_scope(tree_node*, tag_scope)
../../gcc/cp/name-lookup.c:6535
0x93d757 lookup_and_check_tag
../../gcc/cp/decl.c:13990
0x93deff xref_tag_1
../../gcc/cp/decl.c:14104
0x93e8a8 xref_tag(tag_types, tree_node*, tag_scope, bool)
../../gcc/cp/decl.c:14226
0xa34cab cp_parser_elaborated_type_specifier
../../gcc/cp/parser.c:18583
0xa328e6 cp_parser_type_specifier
../../gcc/cp/parser.c:17450
0xa2ce49 cp_parser_decl_specifier_seq
../../gcc/cp/parser.c:14120
0xa48668 cp_parser_single_declaration
../../gcc/cp/parser.c:28165
0xa477da cp_parser_template_declaration_after_parameters
../../gcc/cp/parser.c:27846
0xa484fc cp_parser_explicit_template_declaration
../../gcc/cp/parser.c:28094
0xa48556 cp_parser_template_declaration_after_export
../../gcc/cp/parser.c:28113
0xa2f573 cp_parser_template_declaration
../../gcc/cp/parser.c:15594
0xa41183 cp_parser_member_declaration
../../gcc/cp/parser.c:24332
0xa41076 cp_parser_member_specification_opt
../../gcc/cp/parser.c:24259
0xa3efdd cp_parser_class_specifier_1
../../gcc/cp/parser.c:23400
0xa3fe34 cp_parser_class_specifier
../../gcc/cp/parser.c:23662
0xa32844 cp_parser_type_specifier
../../gcc/cp/parser.c:17424
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.
but that got fixed by 41d93b16cac5b348b7883e259f7880b4a0addc23
