decl test_arrays : Unit -> 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 reference
}