[gambit-list] how does make-default-entry-hook work?
lowly coder
lowlycoder at huoyanjinjing.com
Mon Feb 23 02:33:41 EST 2009
In lib/_repl.scm:
(define-prim
(##make-default-entry-hook)
(let ((settings (##vector #f
#f)))
(lambda (proc args
execute)
(if (##vector-ref settings
0)
(##step-on)) ;; turn on
single-stepping
(if (##vector-ref settings
1)
(##trace-generate
(##make-call-form
proc
(##argument-list-remove-absent! args
'())
##max-fixnum)
execute
#f)
(execute)))))
how does this code work at all? isn't settings #f #f, which would mean the
first if does nothing, and the first part of the second if also does
nothing?
is there some funky dynamic-wind / dynamic scope going on here?
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