[racket-dev] Diagnosing traverse-block errors in scribble

I'm still stuck on the traverse-block problems I posted about a week ago,
but hopefully this is a simpler question to answer than my one from last
week.

I keep getting an error "traverse-block-block: no block computed for
traverse-block", and am trying to understand how to interpret this.  Does
it mean too many or too few (lambda (get set) ...) wrappers around the
block that I'm to build inside traverse-block?

As I understand traverse-block, the number of (lambda (get set) ...)
wrappers is what helps stage the passes.  So if I want to generate data in
the first pass, I need one lambda, but to use that in second pass I need
two lambdas.  Is that the right intuition?

thanks,
Kathi
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