llvm/test/FrontendC++/2009-08-05-ZeroInitWidth.cpp

// RUN: %llvmgxx -S %s -o -
// rdar://7114564
struct A {
  unsigned long long : (sizeof(unsigned long long) * 8) - 16;
};
struct B {
  A a;
};
struct B b = {
  {}
};