no, at all, if you look carefully at what he posted you'll find this:

%hash = {no_arg => \&print_me,
        with_arg => \&print_me("Hello World, again!\n"
        };
[download]

as you can see he uses curly brackets to build a hash and lacks right parenthesis just after "Hello World, again!\n"
what i say is that this code will never work (maybe is just a wrong trascription) and that you can't do

bar  =>\&do_bar("argument")
[download]

so you have to do

bar => sub { do_bar("argument") }
[download]

that's all..
update of course (foo => \&foo) with no arguments is perfectly legal..

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.