Lua Programming Gems, Event System Code Example class impl broken?

[Joe Andresen <joe.andresen@...>]

I'm trying to use the class implementation in the code example

found here.

when i try to do the following i get a nil function call.

thing = class()


function thing:Hello()
  print("hello")
end

SpecialThing = class(thing)

SpecialThing:Hello(); --nil

should this work?
If so, then i think my use of modules combined with this is causing the problem.