decl test_arrays : Unit -> Unit
def test_arrays = {
  var arr1 = [1, 2, 3]
  const arr2 = [] // empty array ??
  var arr3 = [] : Int.5 // TODO: decide ??
  const arr4= ['a'..'z']
  const n = 100;
  var @arr5 = @[] : @Int.n // unique pointer (??)

  var @@arr6 = @@[] : @@Int.n // shared pointer (??)
  var @@arr6_pointer = @@arr6

  const elem1 = arr1.1
  var elem2 = arr1.1
  const *ref1 = *arr1.1 // reference <-> unmanaged pointer (??)
  var *ref2 = *arr1.1
  ; *arr1.1 = 123

  ; ref1 = arr1.2 // set value
  ; *ref1 = *ref2 // set reference

  // ?? references, that can't change ??

  // ?? array access, array mutable access, array get reference to elem ??
  // ?? arrays as basic type ??
  // ?? custom allocators ??
}

// ????????????????????