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
}