If I do this:

#+BEGIN_SRC emacs-lisp
(setq animals '(gazelle giraffe lion tiger))
#+END_SRC

#+RESULTS:
| gazelle | giraffe | lion | tiger |

and then this

#+begin_src emacs-lisp
(defun print-elements-of-list (list)
  "Print each element of LIST on a line of its own."
  (while list
    (print (car list))
    (setq list (cdr list))))
#+end_src

#+RESULTS:
: print-elements-of-list

and finally

#+BEGIN_SRC emacs-lisp
(print-elements-of-list animals)
#+END_SRC

I get nothing for results and "Code block produced no output." in Messages.
Why can't it print out? Same code works fine in the IELM buffer.

LB