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Re:Urn: A Lisp implementation for Lua by marcpaq on Monday March 12, 2018 @09:55AM (#16568128)
I hope this helps: https://github.com/marcpaq/b1fipl

I collect single-file language implementations. None in my collection (so far) use Lua, but I'm always on the lookout.

Re:Urn: A Lisp implementation for Lua by UncleEntity on Monday March 12, 2018 @01:00PM (#16569527)
Minischeme (can be found on github and elsewhere) could go on your list.

I found a copy of the original public-domain code a while back and have been hacking on it here and there, mostly pulling in fixes from tinyscheme.