examples/closure.av

## examples/closure.av

let counter = lambda() ->
  let c = 0;
  lambda() ->
    let result = c;
    c = c + 1;
    return result;
  end
end;

let c1 = counter();
let c2 = counter();

println("test c1...");
for i in range(0, 10) {
  x = c1();
  println(x);
}

println("test c2...");
for i in range(0, 10) {
  x = c2();
  println(x);
}