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/* The bit-field below would have a problem if __INT_MAX__ is too
   small.  */
#if __INT_MAX__ < 2147483647
int
main (void)
{
  exit (0);
}
#else
typedef struct {
  unsigned b0:1, f1:17, b18:1, b19:1, b20:1, f2:11;
} bf;
 
typedef union {
  bf b;
  unsigned w;
} bu;
 
bu
f(bu i)
{
  bu o = i;
 
  if (o.b.b0)
    o.b.b18 = 1,
    o.b.b20 = 1;
  else
    o.b.b18 = 0,
    o.b.b20 = 0;
 
  return o;
}
 
main()
{
  bu a;
  bu r;
 
  a.w = 0x4000000;
  a.b.b0 = 0;
  r = f(a);
  if (a.w != r.w)
    abort();
  exit(0);
}
#endif