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I have the following Lua code:

function makeMessage()
    local f;
    f = function( target, ... )
        send( target, f, unpack( arg ) )
    return f

The key point being that it instantiates a closure that references itself.

How would I do this in C? (C is interesting because it can avoid the whole
pack/unpack the arguments step.) Closures take values on the stack, but at
the point when I'm creating the closure it doesn't exist as a value to put
on the stack.