Hi Ihor,

> There is an inconsistency here between Org parser and
> <https://orgmode.org/worg/org-syntax.html> + manual.
>
> The actual parser does allow empty lang in src blocks, setting :lang
> element property to nil. Should we stop doing this and treat such src
> blocks as paragraphs? Or should we allow empty lang and instead adapt
> the exporters to treat empty lang correctly?

My 2c: a nil lang seems like the “less wrong” option.

All the best,
Timothy

-- 
Timothy (‘tecosaur’/‘TEC’), Org mode contributor.
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/tec>.