https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125680
--- Comment #1 from Boning Chen <berningchen at gmail dot com> ---
This is another, simpler example:
#include <meta>
struct TestStruct
{
struct
{
int b;
} a[4];
};
template <std::meta::info type> struct GetSub
{
consteval static std::meta::info get()
{
if constexpr (std::meta::is_array_type(type))
{
using MemberType = std::remove_extent_t<typename[:type:]>;
return ^^MemberType;
}
else
{
constexpr auto subType =
std::meta::type_of(std::meta::nonstatic_data_members_of(type,
std::meta::access_context::current())[0]);
using MemberType = typename[:subType:];
return ^^MemberType;
}
}
constexpr static std::meta::info value = get();
};
int main()
{
constexpr auto a = GetSub<^^TestStruct>::value;
constexpr auto b = GetSub<a>::value;
constexpr auto c = GetSub<b>::value;
return 0;
}
Output:
<source>:12:38: internal compiler error: in nested_anon_class_index, at
cp/mangle.cc:1814
12 | consteval static std::meta::info get()
| ^~~
0x29f7b88 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x29ec7cb internal_error(char const*, ...)
???:0
0xb34382 fancy_abort(char const*, int, char const*)
???:0
0xca1069 mangle_decl(tree_node*)
???:0
0x18fc585 decl_assembler_name(tree_node*)
???:0
0xff1546 symbol_table::finalize_compilation_unit()
???:0
