After extensive deletions resulting in a ‘writer’ that contained nothing 
but the utility function which tells you which functions are missing at run 
time, I have determined that my code was in fact flawless; the problem was 
that, in my enthusiasm for doing a thing properly, I had added a shebang 
(#!) line to the beginning of the script, without really thinking about it.

Since Lua supposedly treats every file as an independent “chunk” (to use 
the official term), I don’t understand why this should cause trouble, but 
if anyone else runs into a similar issue, at least now we know the fix is 
easy.

In the course of my investigations, I also discovered that Pandoc’s 
internal Lua engine is two revisions out of date. I know Lua 5.3 was only 
released last week, but it includes very basic UTF-8 support, so I was 
really looking forward to using it. Given that even 5.2 was never 
incorporated into Pandoc, I am not very optimistic about that.

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