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> In the meantime, you can try using strings to define the functions to 
> be passed. 

For what it's worth, I've been using a function something like this
for a while:

    function lambda(body)
        return dostring(
            "function _" .. body .. "; return _"

You can add whatever checks for errors you feel are appropriate. The
example being discussed would become:

        lambda("(a) if a > 24 then a = a + 1 end end")

The advantages are that myCollection:do doesn't have to know whether
it is being passed a named or anonymous function and it will be easy
to convert to real anonymous functions in 3.1. The disadvantage is
that errors can be a little tricky to locate.