Removes +org-babel-languages and no longer eagerly loads babel
libraries. If an ob-*.el exists for the language, it will be loaded once
you execute its src block.
Warning: this may interfere with tangling. An unloaded library can't
register a language extension in org-babel-tangle-lang-exts (if any).
This means babel won't be able to figure out the correct file extension
for certain src blocks.
Either load the package explicitly or provide a filename + extension for
the TARGET-FILE argument:
(require 'ob-rust)
(org-babel-tangle-file "notes.org")
;; or
(org-babel-tangle-file "notes.org" "notes.rs")
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