[plt-scheme] auxiliary macros

Thanks a lot!
....
(control resume-here
             (set! name (lambda () (prompt (resume-here 'dummy))))
             x)
.....
me is dummy! The amount of headache I could have missed....

Anyway, I'll try to describe the lessons I've learnt on my blog. It is an
educational exercise.
While I kind of understand the prompt/control interplay, it is a bit hard
reading to understand
the differences with %/fcontrol, shift/reset, .... And I presume the
understanding is crucial, if
I want to be able to use them effectively.
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