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I seemed to have worked out the problem after even more carefully reading the Programming in Lua book. :)

This version works:

function m_installer ()

  module ("m", package.seeall)

  local g  -- forward declare g

  function f ()
    print "inside f"
    g ()  -- call g
  end -- f

 function g ()
    print "inside g"
  end -- g

end -- module m_installer

m_installer ()

m.f ()

Thanks to Vyacheslav Egorov who replied along these lines while I was researching it. :)

I was thinking along the C programming lines, that if you forward declare something (eg. with static) then when you actually define the function the declaration should look the same, which is why I had local again.

- Nick Gammon