{
  var i = "before";

  # New variable is in inner scope.
  for (var i = 0; i < 1; i = i + 1) {
    print(i); # expect: 0

    # Loop body is in second inner scope.
    var i = -1;
    print(i); # expect: -1
  }
}

{
  # New variable shadows outer variable.
  for (var i = 0; i > 0; i = i + 1) {}

  # Goes out of scope after loop.
  var i = "after";
  print(i); # expect: after

  # Can reuse an existing variable.
  for (i = 0; i < 1; i = i + 1) {
    print(i); # expect: 0
  }
}