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(define-module (lang elisp internals trace)
#:export (trc trc-syms trc-all trc-none))
(define *syms* #f)
(define (trc-syms . syms)
(set! *syms* syms))
(define (trc-all)
(set! *syms* #f))
(define (trc-none)
(set! *syms* '()))
(define (trc . args)
(let ((sym (car args))
(args (cdr args)))
(if (or (and *syms*
(memq sym *syms*))
(not *syms*))
(begin
(write sym)
(display ": ")
(write args)
(newline)))))
;; Default to no tracing.
(trc-none)
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