On Jun 22, Valeriya Pudova wrote:
>
> (define (foo a b)
> (for-each (lambda (e) (display e)(newline))
> (continuation-mark-set->context (current-continuation-marks))))
>
> (define (bar a b)
> (foo a b))
>
> (bar 1 2)
> [...]
>
> Interesting. There are no the function bar in the backtrace. Why?
Because it's no longer there -- the tail call replaces it. Try to run
this in DrRacket (exactly as is, don't reindent):
(define (foo3 x)
(/ x "1"))
(define (foo2 x)
(foo3 x))
(define (foo1 x)
(list (foo2 x)))
(define (foo0 x)
(car (foo1 x)))
(+ 1 (foo0 3))
and you'll see that the arrows skip `foo2'.
--
((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay:
http://barzilay.org/ Maze is Life!
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