Script won't work with anything

[xgladius]

running ubuntu, Lua 5.1.5 Copyright (C) 1994-2012 Lua.org, PUC-Rio
lua: /home/teamcity-agent/luafmt.lua:469: assertion failed! stack traceback: [C]: in function 'assert' /home/teamcity-agent/luafmt.lua:469: in function 'groupTokens' /home/teamcity-agent/luafmt.lua:812: in main chunk [C]: ?

[CurtisFenner]

This script isn't super well tested, thanks for posting this, I'll work on a fix (and add a test suite).

I believe the problem is that you're formatting a script with a syntax error in it -- there's probably an unmatched {, (, or [

If it doesn't look like that's the problem, could you post the script / piece of the script that can't be formatted?