https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60497
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For example:
#include <memory>
#include <vector>
struct A;
template<typename T> struct B { T t; };
int main()
{
using UP = std::unique_ptr<B<A>>;
std::vector<UP*> v;
v = v;
}
The self-assignment test in std::vector uses &__rhs which does ADL and tries to
complete A.
Fixing this everywhere might take some time.
