File: main.c

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int main()
{
  int x;
  __CPROVER_assume(0 <= x && x <= 1);
  int y;
  __CPROVER_assume(0 <= y && y <= 1);
  while(1)
  {
    switch(x)
    {
    case 0:
      x++;
      y++;
      break;
    case 1:
      x++;
      break;
    case 2:
      if(y > 10)
        x = 10;
      else
        x++;
      break;
    default:
      break;
    }
    assert(x <= 4);
  }
}