[Haskell-beginners] do-notation question

[aditya siram]

My guess is widgetToPageContent is a function that takes "do addCassius ..."
and returns a value in the monad "m T" where "T" is some datatype like "data
T = PageContent  x y z | ..." . The "<-" removes the "m" from "m T" and
pattern matches  "x", "y" and "z" to "title", "headTags" and "bodyTags".


-deech

On Fri, May 13, 2011 at 9:55 PM, <blackcat at pro-ns.net> wrote:

> In The Yesod Book, I see the following code:
>
> defaultLayout contents = do
>        PageContent title headTags bodyTags <- widgetToPageContent $ do
>            addCassius ...
>
> How does this work?  Is bodyTags drawn from widgetToPageContent and then
> used as the third argument to PageContent?
>
> tia,
> Lee
>
>
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