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On Nov 4, 2009, at 12:35 PM, Patrick Donnelly wrote:


function b()
 local t = pack(pcall(a));
 if not r[1] then error("something") end
 return unpack(r, 2, r.n)

(this is what Roberto's code meant to be I think)

Note there is no closure cost here.

But there is the cost of the pack which may actually be higher depending on how many results you are dealing with v how many upvalues.