Rudolf Adamkovič <rudolf@adamkovic.org> writes:

> Ihor Radchenko <yantar92@posteo.net> writes:
>
>> May you create a test for this with expected failure?
>
> Sure!  Here is one:
>
>   (should
>    (equal "{B}"
>           (org-test-with-temp-text
>               "src_lua{return string.match('A {B} C', '%b{}')}"
>             (org-babel-execute-src-block))))
>
> The return value from 'string.match' is the substring "{B}", which Babel
> misjudges to be a list and signals the error:
>
>   (user-error "Inline error: list result cannot be used")

Maybe something like the attached.
(I am a casual lua user, so better double check)