I'm completely guessing - but does it help to add :results output ?

On 24 November 2017 10:06:12 GMT+00:00, Jakob Simeth <mailinglists@simeth.tk> wrote:
Hi,

I seem to have problems with lua source blocks (others are working
fine): When evaluating a simple block like

#+BEGIN_SRC lua
print("Hello world!")
#+END_SRC

I get an empty RESULT block, and the message "evaluation complete".
I am running org-9.1.3 (within the spacemacs org layer).

Is lua still officially supported? ob-lua.el seems to be part of
org-plus-contrib and lua is listed on
http://orgmode.org/org.html#Languages

However, not on
http://orgmode.org/worg/org-contrib/babel/languages.html

Is there a way to "debug" this?

Thank you,
Jakob