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> No, you can't.  You can only find instances of "function foo()".  You
> don't know what globals are available that are also functions.  Trivial
> example:
> do
>        local flange = function() end
>        ...
>        plinth = flange
> end

yeah, but honestly, who cares about this this case for deriving the
symbols in a file?  The editor is there to help in writing code.  If
you want runtime information at hand,  a debugger.  It's a totally
different situation.