debug.upvaluejoin (f1, n1, f2, n2)
Make the n1-th upvalue of the Lua closure f1 refer to the n2-th upvalue of the Lua closure f2.
debug.upvaluejoin (f1, n1, f2, n2)
Make the n1-th upvalue of the Lua closure f1 refer to the n2-th upvalue of the Lua closure f2.
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