[plt-scheme] tree->generator from t-y-scheme question

Folks,

I'm looking at the tree traversal with continuations example in Teach
Yourself Scheme in Fixnum Days. I think I have an almost complete grasp
on it but I'm missing one bit of info.

In generate-leaves:

...
(else 
    (call/cc 
    (lambda (rest-of-tree) 
        (set! generate-leaves 
            (lambda () 
                (rest-of-tree 'resume))) 
        (caller tree)))))) 

Is it correct to say that rest-of-tree is passed 'resume because
generate-leaves takes no parameters?

What is the rest-of-tree continuation in this scenario, i.e. where's the
"hole"?

...
((generate-leaves 
    (lambda () 
        (let loop ((tree tree)) 
...

Are we starting at the "let" here and assigning the remainder of the tree
to tree?

    Thanks, Joel

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