File: main.c

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int my_func(int stat_loc)
{
  // this is a 'temporary union', yet another gcc extension
  return ((union { __typeof__(stat_loc) __in; int __i; })
    { .__in =(stat_loc) }).__i;
}

int main(void)
{
  int x;
  assert(my_func(x)==x);

  // this is yet another gcc extension
  union my_U
  {
    int z;
    char ch;
    float f;
  } union_object;

  float some_float=1.5;

  union_object=(union my_U)some_float;

  assert(union_object.f==1.5);
}