Point getCenter();

std::string a = f"Center is: {getCenter()}"; // No dangling risk.

auto b = f"Center is: {getCenter()}"; // No dangling problem with P3398

size_t len = f"Center is: {getCenter()}".size(); // Works with P3298

std::println(f"Center is: {getCenter()}"); // Uses optimal overload of println

std::cout << f"Center is: {getCenter()}"; // Uses optimal overload of operator<<

struct abort_msg_s
{
  unsigned int size;
  char msg[0];
};

struct Foo { int a; };
struct Bar { Foo x; int y; };

Foo Bar::*p1 = &Bar::x;
int Bar::*p2 = p1.a;  // <--

struct A {};
struct B : A {};
struct C { B b; };

A C::*ptr = &C::b;  // B C::* to A C::* conversion