Running  through RDoc raises the exception .
What special meaning does have in RDoc? Is it for
inserting (later invisible) comments in the documentation? Where can I
read more about it? Why doesn’t it work?
How can I insert verbatim?
– 0 –
def test() end
– 1 –
convert_special': Unhandled special: Special: type=17, text="<!-- foo -->" (RuntimeError) from <snip>/rdoc/markup/simple_markup/to_html.rb:180:inconvert_flow’