decl test_arrays : -> Unit
def test_arrays = {
  var arr1 = ,1 ,2 ,3
  const arr2 = Int._array: 32
  var arr3 = String._array: 11
  const arr4 = 'a'--'z'
  const n = 100
  var arr5 <- Int._new_array: 10

  var arr6 <- String._new_array: 10
  var arr6_reference = ^arr6
//
//   const elem1 = arr1`0
//   var elem2 = arr1`2
//   const ref1 = ^arr1`1
//   var ref2 = ^arr1`3
//   ; arr1`1 = 123
//
//   ; ~ref1 = arr1`2 // set value
//   ; ref1 = ref2 // set pointer / reference
}