I have been using this site for (yesod 1.4) [http://www.yesodweb.com/book/introduction http://www.yesodweb.com/book/introduction] and I found the documentation

I have been using this site for (yesod 1.4) [http://www.yesodweb.com/book/introduction http://www.yesodweb.com/book/introduction] and I found the documentation current. Is there something that doesn't compile?