class A
{
  uint some;
}

fn doSome(A a) A
{
  // NOTE: section below won't change `a.some` value

  // if (a.some < 1)
  // {
  //   a.some = 1;
  //   return a;
  // }
  a.some = 1;

  return a;
}

A a = new A;
a.some = 0;
printline(a);

a = doSome(a);
printline(a);