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On 11/09/2018 22:14, Roberto Ierusalimschy wrote:
[...]


local Y = function (le)
      local a = function (f)
        return le(function (...) return f(f)(...) end)
      end
      return a(a)
    end



OUCH! My brain hurts!

I can "feel" its beauty, but it's way over my functional head to understand!

(It almost reminds me of the difficulties of understanding Duff's device :-)




-- Roberto