Collecting values from Functors?

[Graham Klyne]

I'm trying to figure if there's any way I can use (say) monads to collect 
values from a Functor.

For example, suppose I have a tree of some values that supports fmap, is 
there any way I can use the fmap function to collect a list of all the node 
values?

#g

-------------------
Graham Klyne
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