Re^4: If I was forced to use only one kind of loop for the rest of my days it would be a

[Anonymous Monk]

(define a (list 1 2 3))
(set-cdr! a a)
(for-each (lambda (x) (display "hello world\n")) a)

[ambrus]

Please read what I said in the parent node.

That's not a proper list, so r5rs doesn't guarantee this will work. It does work with some scheme implementations, but MzScheme says

for-each: expects type <proper list> as 2nd argument, given: #0=(1 . #
+0#); other arguments were: #<procedure:STDIN::59>

if I type this code in it.

Update: let me quote from the r5rs.

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