package foo

import java.util.*;

val d  = {(a : Int) -> a + 1}
val p = {(a : Int) -> a * 3}

val list = ArrayList<Function1<Int, Int>>();

fun chain(start : Int) : Int {
  var res = start;
  for (func in list) {
      res = (func)(res);
  }   
  return res;
}

fun box() : Boolean {  
  if (chain(0) != 0) {
    return false;
  }
  list.add(d);
  if (list.get(0)(0) != 1) {
    return false;
  }
  list.add(p);
  if (list.get(1)(10) != 30) {
    return false;
  }
  if (chain(0) != 3) {
    return false;
  }    
  list.add({it * it});
  list.add({it - 100});
  if (chain(2) != -19) {
    return false;
  }
  if (({(a : Int) -> a * a}(3)) != 9) {
    return false;
  }
  return true;
}