Hello,
learning usage of prompt/abort i've met this
strange behavior (code reduced for this example,
thus not really sensy):
(define (·first occurrences x L)
(define R (filter (λ(ix) (set-member? (list-ref L ix) x)) L))
(take R (min (length R) occurrences)))
(print (·first 5 (set #\q #\a #\h) "this is a sequence."))
(prompt (+ 2 (abort 5)))
is failing (in DrRacket) with:
call-with-continuation-prompt: contract violation
expected: continuation-prompt-tag?
given: #\q
argument position: 2nd
other arguments...:
#<procedure>
#<procedure:...cket/control.rkt:208:45>
The 'prompt line alone, taken from the
reference, is working perfectly, as in some
other environments also. What is wrong here ?
Regards, Joost Behrends
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