test/CXX/special/class.init/class.base.init/p8-0x.cpp

// RUN: %clang_cc1 -std=c++0x -fsyntax-only -verify %s

int n;
struct S {
  int &a; // expected-note 2{{here}}
  int &b = n;

  S() {} // expected-error {{constructor for 'S' must explicitly initialize the reference member 'a'}}
  S(int) : a(n) {} // ok
  S(char) : b(n) {} // expected-error {{constructor for 'S' must explicitly initialize the reference member 'a'}}
  S(double) : a(n), b(n) {} // ok
};

union U {
  int a = 0;
  char b = 'x';

  // FIXME: these should all be rejected
  U() {} // desired-error {{at most one member of a union may be initialized}}
  U(int) : a(1) {} // desired-error {{at most one member of a union may be initialized}}
  U(char) : b('y') {} // desired-error {{at most one member of a union may be initialized}}
  U(double) : a(1), b('y') {} // desired-error {{at most one member of a union may be initialized}}
};