#+NAME: add3
#+BEGIN_SRC elisp :var num=0
(+ 3 num)
#+END_SRC

* Use the function in a drawer header arg
:PROPERTIES:
:header-args: :var n=add3(5)
:END:

#+NAME: whatIsN
#+BEGIN_SRC sh :var n=add3(5)
echo $n
#+END_SRC

#+RESULTS: whatIsN
: 8

#+BEGIN_SRC sh :var a=whatIsN
echo $a
#+END_SRC

# !!!!ERROR!!!!: "variable binding depth exceeds max-specpdl-size"

#+NAME: whatIsN
#+BEGIN_SRC sh :var n=add3(5)
echo $n
#+END_SRC