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// { dg-do run { target c++11 } }
// { dg-additional-options "-O2" }
#include <cassert>
void *
operator new (decltype (sizeof (0)), void *p)
{
return p;
}
namespace std
{
template <typename T>
T *
launder (T *p)
{
return __builtin_launder (p);
}
}
struct A
{
int& x;
};
struct B
{
A a;
};
int
main ()
{
int x = 42;
B b{{x}};
int y = 666;
new (&b.a) A{y};
assert(std::launder(&b.a)->x == 666);
}
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