Let's compile like it's 1992 (2014)(fabiensanglard.net)

  var dynamic = 5

  function foo() {
    print(dynamic)
  }
  
  function bar() {
    var dynamic = 6
    // foo() prints 6 due to the binding above
    foo()
    // After bar() exits, "dynamic" will go back to being 5
  }