That probably means the clojure block is returning nil as the value. I
don't know what it means to return something in clojure, but here is what
you have to do with Python, for example.

#+BEGIN_SRC python :results value code
[1, 2, 3]
#+END_SRC

#+RESULTS:
#+begin_src python
None
#+end_src

You have to explicitly return a value to see it.

#+BEGIN_SRC python :results value code
return [1, 2, 3]
#+END_SRC

#+RESULTS:
#+begin_src python
[1, 2, 3]
#+end_src


John

-----------------------------------
Professor John Kitchin (he/him/his)
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu



On Thu, Jun 24, 2021 at 10:31 AM Johannes Brauer <brauer@nordakademie.de>
wrote:

> What about :results code
> The default is a elisp code block so you get syntax coloring
>
>
> That works fore lisp:
>
>   #+begin_src elisp :results code
> (list 1 2 (+ 1 2))
>   #+end_src
>
>   #+RESULTS:
>   #+begin_src elisp
>   (1 2 3)
>   #+end_src
>
> But with Clojure I get
>
>   #+begin_src clojure :results code
> (list 1 2 (+ 1 2))
>   #+end_src
>
>   #+RESULTS:
>   #+begin_src clojure
>   nil
>   #+end_src
>
>