https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84537
--- Comment #1 from Volker Reichelt <reichelt at gcc dot gnu.org> ---
With a slightly modified testcase (namespace std instead of N) I get
a different stack-trace:
===============================
namespace std
{
template<int> struct A {};
}
std::template A<> a;
===============================
bug.cc:6:17: error: wrong number of template arguments (0, should be 1)
std::template A<> a;
^
bug.cc:3:24: note: provided for 'template<int <anonymous> > struct std::A'
template<int> struct A {};
^
bug.cc:6:15: error: '<expression error>' in namespace 'std' does not name a
type
std::template A<> a;
^~~
bug.cc:6:15: internal compiler error: in maybe_suggest_missing_header, at
cp/name-lookup.c:5519
0x620703 maybe_suggest_missing_header
../../gcc/gcc/cp/name-lookup.c:5519
0x620703 suggest_alternative_in_explicit_scope(unsigned int, tree_node*,
tree_node*)
../../gcc/gcc/cp/name-lookup.c:5547
0x90cf87 cp_parser_diagnose_invalid_type_name
../../gcc/gcc/cp/parser.c:3370
0x9353ed cp_parser_parse_and_diagnose_invalid_type_name
../../gcc/gcc/cp/parser.c:3468
0x93c76f cp_parser_simple_declaration
../../gcc/gcc/cp/parser.c:12946
0x93cfd8 cp_parser_block_declaration
../../gcc/gcc/cp/parser.c:12869
0x940f32 cp_parser_declaration
../../gcc/gcc/cp/parser.c:12767
0x941341 cp_parser_declaration_seq_opt
../../gcc/gcc/cp/parser.c:12643
0x941634 cp_parser_translation_unit
../../gcc/gcc/cp/parser.c:4559
0x941634 c_parse_file()
../../gcc/gcc/cp/parser.c:38866
0xa3f966 c_common_parse_file()
../../gcc/gcc/c-family/c-opts.c:1132
Please submit a full bug report, [etc.]
