using System.Collections.Generic;

class X
{
  public Test (mutable  a : int,mutable  b :  long) :  IEnumerable[int]
  {
    while (a < b) {
      a++;
      yield a;
    };
        }

  static Main () :  int
  {
    mutable  x =  X ();
    mutable  sum = 0;
    foreach ( i in x.Test (3, 8L))
      sum += i;

     if ( sum == 30) 0 else  1;
  }
}

/*
BEGIN-OUTPUT
END-OUTPUT
*/