gcc-4.9/gcc/testsuite/gcc.c-torture/execute/20031211-1.c


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struct a { unsigned int bitfield : 1; };

unsigned int x;

main()
{
  struct a a = {0};
  x = 0xbeef;
  a.bitfield |= x;
  if (a.bitfield != 1)
    abort ();
  exit (0);
}