All uses auto&& in function signatures potentially undefined behavior #175
Description
Line 719 in 2f37277
Its not equal to decltype(auto).
If returns by value, then auto&& generates dangling rvalue reference, while decltype(auto) returns by value as needed
https://godbolt.org/z/7Gfr5fb1d
template< typename C, typename X >
requires std::is_same_v<C, X>
auto as( X const& x ) -> auto&& {
return 5;
}
int main() {
static_assert(std::is_same_v<decltype(as<int>(5)), int&&>);
}