The Chaos Programming Language(chaos-lang.org)

    array a = [1, 2, 3]
    a.append(4)

  function add(x, y) {
    x = x + y
    return x
  }

   λ>  let foo = 1
   λ>  let foo = 2
   λ>  foo
     => 2

   λ> let foo = 1 in ( let foo = 2 in foo )
     => 2

  (let [foo 1
        foo 2]
    foo)
  ;; => 2

  a[15] = 44

  a = a.updateAt(15,44)

  <interactive>:8:5-7: warning: [-Wname-shadowing]
      This binding for ‘foo’ shadows the existing binding
        defined at <interactive>:6:5

  def a(0), do: "a"
  def a(1), do: "b"
  def a(_n), do: "c"

  str def a(n)
    num x = n
  end {
    x == 0 : "a"
    x == 1 : "b" 
    default: "c"
  }