52emu.lua

local track={}
setmetatable(track,{__mode="v"})
function setmetatable52(t,mt)
	if mt.__gc then
    local p = newproxy(true)
		track[p] = t
		getmetatable(p).__gc = function(p)
      local mt = debug.getmetatable(t)
      if mt and rawget(mt, "__gc") then
  			rawget(mt, "__gc")(t)
      end
		end
	end
	setmetatable(t,mt)
end

t={}
print(t)
m={__gc=function(tt)
	print('got call, now resurrecting',tt)
	t=tt
	setmetatable52(tt,m)
end}
setmetatable52(t,m)
t=nil
for i=1,10 do collectgarbage("collect") end
t=nil
for i=1,10 do collectgarbage("collect") end
os.exit()