ladybird/Base/home/anon/js/simple-scopes.js

function foo() {
    function bar() {
        var y = 6;
    }
    
    bar()
    return y;
}
foo(); //I should return `undefined` because y is bound to the inner-most enclosing function, i.e the nested one (bar()), therefore, it's undefined in the scope of foo()