请看下面的代码：

proc generateTuples(a: int, b: int, bNext: int): [] {
  var tuples: [1..?] (int,int);
  for q in (b+1)..(bNext-1) {
    tuples.push([a, q]);
  }
  return tuples;
}

proc mergeLists(l1: [(int,int)], l2: [(int,int)]): [(int,int)] {
  var result: [1..?](int,int);
  var i1:int = 1;
  var i2:int = 1;
  while ((i1 <= l1.size) && (i2 <= l2.size)) {
    if l1[i1] < l2[i2] {
      result.push(l1[i1]);
      i1 += 1;
    } else {
      result.push(l2[i2]);
      i2 = i2+1;
    }
  }
  result.append(l1[i1..l1.size]);
  result.append(l2[i2..l2.size]);
  return result;
}

proc generateTuplesSub(L: [1..?](int,int), start: int, end: int): [] (int,int) {
  writeln(start," ",end);
  if end <start  {
    var b: [1..0] (int,int);

    return b;
  }

  var mid: int = (start + end) / 2;
  var aMid = L[mid][0];
  var bMid = L[mid][1];
  var tuplesLeft = generateTuplesSub(L, start, mid);
  var tuplesRight = generateTuplesSub(L, mid, end);

  // Merge the tuples generated for the left and right halves
  var result = mergeLists(tuplesLeft, tuplesRight);

  // Add the tuples generated for the (aMid, bMid) pair
  if mid < end - 1 {
    var bNext = L[mid+1][1];
    var tuplesMid = generateTuples(aMid, bMid, bNext);
    result = mergeLists(result, tuplesMid);
  }

  return result;
}

// Example usage
var L = [(0, 4), (1, 5), (2, 6), (3, 7), (4, 8), (5, 10), (6, 12)];
var numProcesses = L.size;

var result = generateTuplesSub(L, 1,7);
for tup in result {
  writeln("(", tup[1], ", ", tup[2], ")");
}

它是用Chapel编程语言编写的。我得到了以下错误：

called as generateTuplesSub(L: [domain(1,int(64),false)] 2*int(64), start: int(64), end: int(64))
note: generic instantiations are underlined in the above callstack.

什么意思？怎么办？我是用Mac的终端编译的，好像输入的类型有问题，但是我不明白。
当我想编译它的时候，我得到了错误。