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Tony Finch wrote:

  local t = {}
  local s = "function f() a = 3 print(a) end"
  local chunk = assert(loadstring("in ... do "..s.." end"))
  chunk(t)
Yes, that's what Luiz suggested. But it's not exactly efficient (think of embedded systems) unless a wrapping loading function is used on the C side, as he said. Both techniques are not exactly elegant, especially in a clean language like Lua.
Besides, it could be convenient to be able to execute a chunk in different environments without reloading it. 

(I'm not complaining, I'm just trying to fully understand the motivations)

  Enrico