Lua: Table of functions

Question

I am trying to store different functions in a table, but somehow it won't work the way I thought it would. Here is my 'code'

fn_table = { aFun1=print, aFun2=self:getSpeedLevel, aFun3=.... }

The problem now is that I can do this with the built in functions like print, assert and so on but it wont work with the other functions I've got.

I get the error: "... function arguments expected near '}'

Is it possible to store these function as well?