[Haskell-beginners] do-notation question

[Arlen Cuss]

>  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?

I believe it's a pattern match; widgetToPageContent returns a
PageContent (in some monad), which is bound to "PageContent title
headTags bodyTags" -- so the three variables are bound to.

>  tia,
>  Lee
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