[Haskell-beginners] Yesod error

[Lee Short]

I am working my way through the Yesod book and I am having trouble 
writing any code that uses persist.  I am consistently getting

Not in scope: 'persist'

at the point I am invoking the persist quasiquoter.  This even happens 
when I am using the example code verbatim.  Tried updating to the latest 
versions of yesod, persist, etc.  Didn't help.  The Hackage docs don't 
show any info on the quasiquoters in found in a package (presumably 
because they are a language extensio).

Anybody seen this before?  Or got any ideas how I could debut this?

thanks,
Lee