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> Here is my version:
> 
>   [...]
>       local enter = lpeg.P(function (s, p, ...) print("ENTER", k) return true end)
>       local leave = lpeg.P(function (s, p, ...) print("LEAVE", k) return false end)

I minor detail:  These two functions do not need parameters:
  "lpeg.P(function () print(..."

-- Roberto