closure :: fn() do
    value := "Closure";
    internal :: fn() do
        print value;
        return value;
    end
    return internal;
end

internal := closure();
internal();

a := "Global";
b := a;
c := b;
c = b = a;
d := c = b = a;
do
    showA :: fn() do
        print a;
    end

    showA();
    a := "Local";
    showA();
end